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ATT's network...

Has anyone had a problem today where your phone just cannot connect to ATT's 3G or HSPA network? For some reason, my phone is getting little-to-no signal, and if I do, it is only on GPRS... I CWM'd to my stable nandroid, but no dice, leading me to think that this problem is with the network.
What's XDA's thought on this? Possible dev issue?
Sent from my SGH-I897 using XDA App

Att network just sucks.....I get good service everywhere but the places im at the most....my house and my job....go figure
Sent from my SAMSUNG-SGH-I897 using XDA App

Their network is just pretty terrible right now. However, by summer we'll probably be singing a different tune about ATT's coverage when the iPhone user population will even out a bit. Also, I believe ATT threw down a few billion for network upgrades this year. It seems like they really took that Consumer Reports article to heart, so I actually see good things in the future.

i haven't had 3G in 24+ hours in NJ. stock, non-rooted.

Must be location specific; -51 dB and HSDPA in Dallas

It happens every now and then in las vegas usually right after a flash. I start to change modems and other stuff then realize "dammit I bet the network is screwed up" sure enough next day things are working again. Damn phone companys lol
Sent from my SuperDuper!Captivate | PHOENIX RISING VERSION 3.5 with KP1 Modem | FireBird Kernel 2

i haven't had 3G in 24+ hours in NJ. stock, non-rooted.
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You're quite close to where I am, it's probably regional then, but my old crappy phones' 3G is working fine though...
Sent from my SGH-I897 using XDA App

funny thing metro pcs is working better than ATT in south florida. metro is known for bad bad reception

No problems with 3G at the places I frequent in the Tampa Bay area.
I've not had any problems with 3G connections this year.

Aus_Azn said:
You're quite close to where I am, it's probably regional then, but my old crappy phones' 3G is working fine though...
Sent from my SGH-I897 using XDA App
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interesting.. i spent a few hours yesterday with my phone going in and out with GPRS and no network connection at all. i've had fairly consistent EDGE ever since. i normally see 5 bars of 3G at my current location (newark, NJ).
reboots and battery pulls seem to have no effect.

-99db & HSDPA here in Tampa Bay area.
Sent from my SGH-I897 using XDA App

No AT&T 3G here...but I use edge network, get mostly 3 to 5 bars mostly indoors or outdoors depending on location. At my work, it's pretty good signal and get around 150-180kbps speed but at home is slower which is around 100-125kbps or slower, probably. I usually use wifi at my home with my own internet.

Out of Davenport, IA and I have great HSDPA signal running Perception 10.1 with the included 2.6.32.9 Firebird Kernel. I have flashed a bunch of DGs ROMs and never had issues with connectivity (voice or data).

I also get that the sim card.has been removed and its pissing me off.... btw, im on phoenix 3.5 with a setiron 1.5.6

matt868686 said:
interesting.. i spent a few hours yesterday with my phone going in and out with GPRS and no network connection at all. i've had fairly consistent EDGE ever since. i normally see 5 bars of 3G at my current location (newark, NJ).
reboots and battery pulls seem to have no effect.
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Click to collapse
I have 3G again, but regardless of HSPA or UMTS, I am getting .06Mbps down and about .4Mbps up. I have absolutely no idea why. I'm in Bridgewater, NJ.
I am in much the same predicament as you, reboots and pulls don't help. I've gone a step further and flashed 5 different ROMs today, no luck.
Sent from my SAMSUNG-SGH-I897 using XDA App

actually my 3G just came back a few hours ago too. 2-4 Mbps down and about 0.3 Mbps up, which are normal 3G speeds for me. and i didn't do anything to my phone, 3G just magically reappeared after at least a full 24 hours of only EDGE. strange.
Aus_Azn said:
I have 3G again, but regardless of HSPA or UMTS, I am getting .06Mbps down and about .4Mbps up. I have absolutely no idea why. I'm in Bridgewater, NJ.
I am in much the same predicament as you, reboots and pulls don't help. I've gone a step further and flashed 5 different ROMs today, no luck.
Sent from my SAMSUNG-SGH-I897 using XDA App
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Kizzmiazz said:
It happens every now and then in las vegas usually right after a flash. I start to change modems and other stuff then realize "dammit I bet the network is screwed up" sure enough next day things are working again. Damn phone companys lol
Sent from my SuperDuper!Captivate | PHOENIX RISING VERSION 3.5 with KP1 Modem | FireBird Kernel 2
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Las Vegas + ATT = terrible.
I just went on a 2 say trip there, took me 2 hours to download a 37kb attachment with full bars. I'd get 30 text messages at once an hour late, with full bars.
If I had to work on the strip I'd drop att in a heartbeat... that is totally unfunctional!!
I've been fine elsewhere... and maybe that's just a bad day /spot... but damn!
Sent from my GT-I9000 using XDA App

matt868686 said:
actually my 3G just came back a few hours ago too. 2-4 Mbps down and about 0.3 Mbps up, which are normal 3G speeds for me. and i didn't do anything to my phone, 3G just magically reappeared after at least a full 24 hours of only EDGE. strange.
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My definition of normal is >3Mbps down, >1.5Mbps up... How is yours so different when you are so near? I get these speeds regardless if I'm on HSUPA or UMTS. I tend to use the latter to save battery.
The more I look, the more I think that ATT just capped my speeds 2 nights ago. This is crap. No modem change, nothing fixes it.
Sent from my Samsung Galaxy S using XDA App

We finally got 3G here and its expanding rapidly in this state which is a good thing. I would like to see new coverage plans after March 31st.
Sent from my SAMSUNG-SGH-I897 using XDA App

AT&T 4G are you on it?

After getting very poor speeds, I never got above 4.1, I stopped in my local AT&T shop.
Turns out that when I went from my Blackberry to the Infuse, they never put me on the 4G plan, only on the unlimited data plan.
I haven't been up to Nashville to test whether my Infuse is now connecting at AT&T's 4G, but I just wanted to let everyone know. That if you got grandfathered in, they may not have put you on the 4G unlimited plan.

4g umlimited plan is just what their calling their data plans for "4g" devices right now. There 4g network is just a spruced up 3g network and since we use 3g sims it doesnt matter what your plan is you should get faster speeds if they backhauled the network ware you live.
Sent from my SAMSUNG-SGH-I997 using xda premium

Truckerglenn said:
After getting very poor speeds, I never got above 4.1, I stopped in my local AT&T shop.
Turns out that when I went from my Blackberry to the Infuse, they never put me on the 4G plan, only on the unlimited data plan.
I haven't been up to Nashville to test whether my Infuse is now connecting at AT&T's 4G, but I just wanted to let everyone know. That if you got grandfathered in, they may not have put you on the 4G unlimited plan.
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Click to collapse
I doubt there is a 4G data plan. I am using a 3+ year old SIM (doesn't even say 3G on it) and am getting 5mb speeds and haven't spoken with ATT in years.
Sent from my GT-P7510 using xda premium

MisterEdF said:
I doubt there is a 4G data plan. I am using a 3+ year old SIM (doesn't even say 3G on it) and am getting 5mb speeds and haven't spoken with ATT in years.
Sent from my GT-P7510 using xda premium
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so you doubt there is a 4g data plan because you have had the same sim card for 3 years and get 3g data speeds???
bottom line there are different data plans for 4g hspa+ data, (same price but different feature code/provisioning) those who dismiss this idea as some kind of att conspiracy theory, well i dont know what to tell you, but maybe you should put some tape over the front facing camera on your phones so "they" cant watch you!

Tomdg07 said:
so you doubt there is a 4g data plan because you have had the same sim card for 3 years and get 3g data speeds???
bottom line there are different data plans for 4g hspa+ data, (same price but different feature code/provisioning) those who dismiss this idea as some kind of att conspiracy theory, well i dont know what to tell you, but maybe you should put some tape over the front facing camera on your phones so "they" cant watch you!
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LOL well said my man. I got that camera on my Thrill 4G as well makes you think huh? Maybe the big blue monster of AT & T really is watchinge type this. Muahahaha!
Sent from my LG Thrill 4G using XDA Premium app.

Speed tests are not that great...
Well i have noticed that the two major speed test apps are not really that good testing. They are too all over the place, but i can tell my speeds are gaining every day a little bit. 4G is in my area, which i am not supposedly connecting to it fully because i have to wait a while, and I am on the uckd5 modem which seems to work best for me. What is the best speed test app?

I've thought about flashing the uckd5 modem just to see if going back makes a difference.

Truckerglenn said:
I've thought about flashing the uckd5 modem just to see if going back makes a difference.
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D5 isn't going to give you better speeds just by virtue of it being the stock modem that came with the phone...
E3 is supposed to be an improvement on D5... same with G3, but that's it's own special case, since it is the Rogers modem. and H1 is supposed to be an improvement over E3.
i have noticed that they are all very similar when it comes down to it. i get the same speeds with each of them, signal is the same within 10 dbm, and call reception is not different enough among them to notice.
too many variables at play (atmosphere, tower usage, time of day, etc.) to really make a fair determination that one of them is much better than the other.
but yeah, i guess my point is that you won't see better speeds just because you are switching to the modem that the infuse came with, and is "supposed" to be using.

mfpearson said:
D5 isn't going to give you better speeds just by virtue of it being the stock modem that came with the phone...
E3 is supposed to be an improvement on D5... same with G3, but that's it's own special case, since it is the Rogers modem. and H1 is supposed to be an improvement over E3.
i have noticed that they are all very similar when it comes down to it. i get the same speeds with each of them, signal is the same within 10 dbm, and call reception is not different enough among them to notice.
too many variables at play (atmosphere, tower usage, time of day, etc.) to really make a fair determination that one of them is much better than the other.
but yeah, i guess my point is that you won't see better speeds just because you are switching to the modem that the infuse came with, and is "supposed" to be using.
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I could get 6mb download with stock infuse rom, now on infused 2.1 or serenity 7, I can't over 4, think it's just coincidence? I really don't know that much about the modems and their software, I'm a noob at this stuff.
Sent from my SGH-I997 using Tapatalk

steadly2004 said:
I could get 6mb download with stock infuse rom, now on infused 2.1 or serenity 7, I can't over 4, think it's just coincidence? I really don't know that much about the modems and their software, I'm a noob at this stuff.
Sent from my SGH-I997 using Tapatalk
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Those are Rogers GB based ROM's, which are known to have HSPA+ problems.

steadly2004 said:
I could get 6mb download with stock infuse rom, now on infused 2.1 or serenity 7, I can't over 4, think it's just coincidence? I really don't know that much about the modems and their software, I'm a noob at this stuff.
Sent from my SGH-I997 using Tapatalk
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not a coincidence at all. that's how it should be. if you are truly supposed to be getting 4g speeds in your area, you probably won't see those speeds on a GB based ROM until we no longer have to use Rogers GB as the base for those ROMS.
once the infuse gets the GB update, and the ROMS are based on that update, speeds should be what they are supposed to be.
but your issue is the ROM you are on - not the modem you are using.

My thought.
I am running infused v2.1 with the kd5 modem. I see that the longer i stick with one modem, speeds start increasing. This happens a lot faster with the original modem. Does any one else notice this?

Ryanscool said:
I am running infused v2.1 with the kd5 modem. I see that the longer i stick with one modem, speeds start increasing. This happens a lot faster with the original modem. Does any one else notice this?
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now THAT actually is a coincidence, haha.

Why are my "4G" speeds so incredibly slow?

I know not to expect LTE speeds from AT&Ts HSPA+, but it shouldn't be what it is in my opinion.
Average is .9/1 D/U with speedtest. Ping is 100-200ms most of the time, never lower, sometimes higher.
Fastest result I EVER got is 3/.1 that was at 3AM in a rural area (HSPA in rural areas you say? yep.). So is my phone's hardware bad, is Minnesota bad for HSPA+ in general, or is it something else?
Most people get at least 3/3 on average, and I haven't gotten that once.

Depends on where u are at. I got 6/3 around DC. Back in raliegh it is usually 3/1 d/u.
I think att just does not have 4g in many places.
Sent from my SAMSUNG-SGH-I997 using xda premium

It's HSPA+, that I know. I asked them at the store, I've looked at maps, and I believe a few of my friends with ATT "4G" phones get HSPA+ in my house.
3G is like 150Kbps, even though my "4G" is 6x faster, that's not exactly fast. It's like dial up compared to 512k DSL.

I get between .7 and 2+ at my house. When I'm up & around Nashville I get 2 to 5 on average. I'm sure that once att releases gingerbread for us, the dev's will have some good roms finished.
Cranky...

I hear some Carriers reserve the right to throttle a user's bandwidth if they decide that the user has used too much bandwidth for the month (e.g. by tethering, making the phone act as a server, etc.)
Sent from an unrooted DroidX using XDA app.

You know... every samsung android phone I've owned has had the problem. Except, for me, it will sometimes be really fast, and other times be really slow, all on 4g and all in the same area. It's very strange.

I browse a bit and download apps, I don't tether or anything. And I have a 200MB plan so it's not like they would even do anything about tethering, a full sized computer uses than in 10 web pages.
My friend with an HSPA+ phone is coming over in a few hours, I'll get his phone from him and see what his speeds are. If they're much higher than mine I'm complaining to AT&T or Samsung.

strychninetwitch said:
My friend with an HSPA+ phone is coming over in a few hours, I'll get his phone from him and see what his speeds are. If they're much higher than mine I'm complaining to AT&T or Samsung.
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when your friend comes over why don't you both run some tests, than swap sim cards and run same tests, this will help validate if issue is with your phone or with your account/line being routed improperly or something.
Sent from my SAMSUNG-SGH-I997 using xda premium

Tomdg07 said:
when your friend comes over why don't you both run some tests, than swap sim cards and run same tests, this will help validate if issue is with your phone or with your account/line being routed improperly or something.
Sent from my SAMSUNG-SGH-I997 using xda premium
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Will do.
10char

What ROM are you running?

I also had a problem switching from an iphone, I only had a 200mb data plan, then I got the infuse never told them I switched. I was getting really slow speeds I called at& t they said I need to upgrade to a 4g data plan. After that my speeds improved immediately after a reboot.
Sent from my SAMSUNG-SGH-I997 using XDA App

@Entropy, it happens with any ROM, but in case you wanted to know for some other reason... infused 2.3.3
@BadFisH, it's a 4G data plan. They activated it at a kiosk in a mall and it's a 4G labeled SIM (not that that ACTUALLY makes a difference).

strychninetwitch said:
@Entropy, it happens with any ROM, but in case you wanted to know for some other reason... infused 2.3.3
@BadFisH, it's a 4G data plan. They activated it at a kiosk in a mall and it's a 4G labeled SIM (not that that ACTUALLY makes a difference).
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Including stock Froyo?

Entropy512 said:
Including stock Froyo?
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Stock froyo for me was super fast especially with uckh1 roms do seem to slow it down but Idc
Sent from my SAMSUNG-SGH-I997 using xda premium

tyshemi said:
Stock froyo for me was super fast especially with uckh1 roms do seem to slow it down but Idc
Sent from my SAMSUNG-SGH-I997 using xda premium
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Any Froyo ROM should be fast, but since he's talking about complaining to AT&T and Samsung - well you've gotta be on an official release to have a valid complaint.

Yeah stock froyo is the same as any GB or other custom ROM. And yeah you have to be on stock for a claim, but I can easily use the unbricker to go back to stock.

strychninetwitch said:
Yeah stock froyo is the same as any GB or other custom ROM. And yeah you have to be on stock for a claim, but I can easily use the unbricker to go back to stock.
Click to expand...
Click to collapse
Try testing at an off-peak time... I'm surprised you have full HSPA+ service in a rural area.
FYI all of our Gingerbread ROMs are known for poor data performance. One of the top three known issues with UXKG3. However if Froyo (esp. stock) is also problematic - it's likely that your area doesn't actually have HSPA+ service deployed yet.
Don't believe lowly store reps. If they had more of a clue they wouldn't be working in a retail store...

On stock froyo I was getting 3-5 dl and maxed at a little over 12, then when I went to gingerbread im getting 4-6 but capped at about 9-10. My overall speeds are way faster, but my max is a little less, I'm guessing it has to do with the launch of a bunch of new 4g devices and more users are on the network. Other than that I'm happy with my infuse running GTGs Infused 2.2.3.

The Infuse is the fastest device I've ever seen. Typically, I see devices in my area get 1-3 mbps down and .7-1 mbps up. Without fail, the Infuse gets triple, sometimes quadruple that (uploads generally the same).

My friend's atrix only got around 100Kbps higher when we ran speedtest at the same time. Guess it's crap HSPA+ out here, though it IS HSPA+.

EP4P Radio Impressions

If you are willing to share your experiences with the new radios, post away!
I am primarily curious how the radios behave on 3G. For me its too early to tell, so I will post after some testing. So far they seem roughly the same as EP3HA radios although I did have to pull the SIM to get it to behave after flashing. I'm hoping it will be stable now.
I got the new Radios over at mydroidworld. There is a EP4P radio thread on rootzwiki but XDA seems to get a lot of traffic so I posted here. I'll post links if you would like me to.

Personally i think the signal strength is lower everywhere compared to the EE4 and EP1-3 radios. Never had ant data dropping on any radio so can't comment on that.
Sent from my SCH-I510 using XDA App

Work great for me!
I think they are a bit better from EE4. I have dropped signal too many times to count on all the previous radios, but I have been using this for 2-1/2 days and, so far, haven't dropped once. The signal seems overall better, I have 3 bars in the basement of my house when I normally would have 2 on the other radios. Texts work quick, and calls come in quick (I called myself from our house phone and texted myself from my iPod and other phone. Seems to be equal or better to EE4. At least for me.

strangely enough I get better battery life on cdma/lte then cdma only :-/

davwman said:
strangely enough I get better battery life on cdma/lte then cdma only :-/
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Click to collapse
Same here. Plus, I have more problems (Lose connection, etc.) on CDMA only than on CDMA/LTE.

davwman said:
strangely enough I get better battery life on cdma/lte then cdma only :-/
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Click to collapse
That's... Strange
Sent from my SCH-I510 using Tapatalk

I won't comment on signal strength or quality, but I will say that in the last 2 or 3 modems there have been some huge glaring bugs in how it picks up 3g signal while LTE is enabled... The bugs I had experienced in the last 2 or 3 modems are not there, so far. This means that I can get 3g data in places that I the last couple modems failed to get 3g if LTE was enabled. I could disable LTE and get 3g signal, but even that was buggy / glitchy at best. Using a much earlier modem I would get consistent 3g signal in those places.

quarky42 said:
I won't comment on signal strength or quality, but I will say that in the last 2 or 3 modems there have been some huge glaring bugs in how it picks up 3g signal while LTE is enabled... The bugs I had experienced in the last 2 or 3 modems are not there, so far. This means that I can get 3g data in places that I the last couple modems failed to get 3g if LTE was enabled. I could disable LTE and get 3g signal, but even that was buggy / glitchy at best. Using a much earlier modem I would get consistent 3g signal in those places.
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Same
Sent from my SCH-I510 using Tapatalk

I am having problems with SMS on this build, I'm not sure if it is the radio's fault or not. I'm getting a lot of "failed" messages that will go out after a retry. Twice now, though, I've had to reboot the phone to get messages flowing again.

bluevolume said:
I am having problems with SMS on this build, I'm not sure if it is the radio's fault or not. I'm getting a lot of "failed" messages that will go out after a retry. Twice now, though, I've had to reboot the phone to get messages flowing again.
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Click to collapse
Same here
Sent from my SCH-I510 using XDA App

I STILL get the nasty audio pops on speakerphone, though it appears to be fixed on the earpiece and bluetooth modes.

The new radio made my 3G speeds surprisingly usable (was practically useless in my neighborhood with any other radio) but 4G still drops out quite often.

Mine was dropping data constantly at first like other roms then it just went away now it works like it should. Im clueless to why its working but I'm a happy boy now
NO BARS DROID CHARGE

VRBLI5

Not recommended to flash the modem unless you are in a good 4G area. I clean flashed AOKP M1 ROM flashed VRBLI5 modem . While in good 4G area had no problems as soon as I left (I am a truck driver) my signal and data started acting up. No data or 1x data signal also cell signal very week and a few dropped calls. So I flashed the VRLAHE modem now I got 3G back signal also better.
I think that VRBLI5 is optimized for 4G but this is just my experience.
Sent from my SCH-I535 using xda app-developers app

Thanks for the heads up.

No problem ever since I flashed back to VRALHE modem an hour ago l had no problems with my signal or data. Good 3G n 4G n cell signal. Glad to help.
Sent from my SCH-I535 using xda app-developers app

Excellent. I will check this out.

Lehocki said:
No problem ever since I flashed back to VRALHE modem an hour ago l had no problems with my signal or data. Good 3G n 4G n cell signal. Glad to help.
Sent from my SCH-I535 using xda app-developers app
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Playing Devil's advocate here, could the bad signal just have been a really crappy area? I'm in the northeast and I know parts of Maine I fluctuate considerably and lose signal all together. Other phones do the same so I know it's not my S3.

So tempted.. I already DL the file!
¤ Sent from The Third Galaxy ¤

"Playing Devil's advocate here, could the bad signal just have been a really crappy area? I'm in the northeast and I know parts of Maine I fluctuate considerably and lose signal all together. Other phones do the same so I know it's not my S3."
Not really as soon as I flashed "HE" modem signal and data returned to normal. As I said I'm a truck driver and in the past year and a half since I got my first android phone there were only 4 or 5 occasions my 3G dropped to 1x and that was only in PA and WV in the mountains. Where I was now in IL on an interstate it should not have happened. VZW has the whole USA covered with 3G. A couple months ago I was driving through WY not a town in a 80mile radius and still had 3G. Believe me I was pleasantly surprised.
Sent from my GT-P3110 using xda app-developers app

New modem is working great for me. Did a speed test and got 28 down and 3 up on the extended network.
Sent from my SCH-I535 using xda premium

Worked fine for me too while I was in a good 4G area the problems started once I left the city. As I mentioned it is probably optimized for 4G . If you are and stay within the city that has 4G you probably not going to c a difference between HE and I5
Sent from my SCH-I535 using xda app-developers app

Lehocki said:
Worked fine for me too while I was in a good 4G area the problems started once I left the city. As I mentioned it is probably optimized for 4G . If you are and stay within the city that has 4G you probably not going to c a difference between HE and I5
Sent from my SCH-I535 using xda app-developers app
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Click to collapse
I usually stay on 3g until I step out of my house or until I go to town. I haven't noticed a difference thus far in my area. I was also in a extremely strong 4g area when I flashed and it changed to 3g without a problem and has the same service I have always had. I'm personally running Paranoid android 2.52.
Sent by one of my many Anthromorphic Personifications

The new radio reflects a better signal for me...all phones act different, so this alarm topic is just your experience.

Lehocki said:
Not really as soon as I flashed "HE" modem signal and data returned to normal. As I said I'm a truck driver and in the past year and a half since I got my first android phone there were only 4 or 5 occasions my 3G dropped to 1x and that was only in PA and WV in the mountains. Where I was now in IL on an interstate it should not have happened. VZW has the whole USA covered with 3G. A couple months ago I was driving through WY not a town in a 80mile radius and still had 3G. Believe me I was pleasantly surprised.
Sent from my GT-P3110 using xda app-developers app
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Click to collapse
That's kinda messed up about your trip thru WY, the parts Maine that don't have any coverage from Verizon have plenty of towns lol.

well i hate to be that guy but i.think your issue is on your end
... lastnight the club where i shoot trap has no lte. my device usually will drop data there. this is the first time i had solid 3g and it even switched down to 1x but data never dropped! also lte signal seems improved aswell. imo this is the best radio to date.

this radio has been an improvement for me. in my office i am lucky to get 3g. this new radio has given me a steady 3g signal all day so far

New radio is working fine for me as well.
Sent from my SCH-I535 using xda app-developers app

Just wanted to add my experience as well. After 24 hours using this radio, I can say that signal is much improved on 1x with data off and LTE had never been this fast for me. Pulled 48 down 20 up this morning here in Hollywood.
Sent from my SCH-I535 using xda premium

On the official release of Miui which has had many reports of data issues. Flashed new radio yesterday, I am in a fringe 4g area, and the handoffs from 3g to 4g seem to be much better for me. Previously after moving into a 3g area, I would have to go into airplane mode in order to get 4g back, now it seems to be switching on its own.

I wish someone would explain the whole rpm thing. Does it need flashed with the modem? Does it need flashed everytime we change the Rom? Do we even bother flashing it if we are not on the stock Rom? Why has there never been an rpm zip with every other modem?
We need answers!
Sent from my SCH-I535 using xda premium

xsteven77x said:
I wish someone would explain the whole rpm thing. Does it need flashed with the modem? Does it need flashed everytime we change the Rom? Do we even bother flashing it if we are not on the stock Rom? Why has there never been an rpm zip with every other modem?
We need answers!
Sent from my SCH-I535 using xda premium
Click to expand...
Click to collapse
ok now bear with me...lol I have been extensively doing some research on this topic. It seems RPM has to do with power management for the radio. This was implemented on the G7 update. I had no clue because I never take OTA's...In order to see the signal improvements the rpm file should be flashed with the latest radios. However nothing negative will occur by not flashing the RPM.zip. I believe this was an attempt to help fix ril issues with data handoffs and spotty 3g signal.
So if you flash just the I5 radio and dont notice any improvements or even worse signal try flashing the rpm.zip and I can about gurantee an improvement will be noticed. I can not believe how much better the 3g to 1x signal and data handoff has improved!! Anybody is more than welcome to chime in and correct me if this is incorrect. There is not much info on this topic as I spent a couple hrs putting bits of information together to come up with this conclusion...hope it helps!

I flashed this new modem/radio,and frankly, I see 4g on my phone more now than I did with the G1 that was on it previously. Everything else works as good, possibly better than before, though I did not take any measurements before flashing.