[Help] How to switch from 3G to 4G - Verizon Samsung Galaxy S III

Hello,
I have Samsung GS3 verizon SCH-I535 With CM13 installed , works perfectly , APN well configured and i connect with 3g, but i still have a problem.
Yesterday i upgraded to 4G , when i plugged the new 4g sim card and rebooted, i had no Network at all, i couldnt even make calls, so i go to settings ==> Network ====> and selected GSM/WCDMA and the network and 3g worked , if i chose LTE or other options it will switch the network off and wont work.
Please help me guys , what should i do ??!

RashidVet said:
Hello,
I have Samsung GS3 verizon SCH-I535 With CM13 installed , works perfectly , APN well configured and i connect with 3g, but i still have a problem.
Yesterday i upgraded to 4G , when i plugged the new 4g sim card and rebooted, i had no Network at all, i couldnt even make calls, so i go to settings ==> Network ====> and selected GSM/WCDMA and the network and 3g worked , if i chose LTE or other options it will switch the network off and wont work.
Please help me guys , what should i do ??!
Click to expand...
Click to collapse
The 4G signal that the networks worldwide use are not the same, GSM 4G is not the same as CDMA 4G, also, some 4G devices in the past were not true 4G, they used Wimax which is not actual 4G. My point is, the 4G your network uses is probably a different signal type or its bands do not match the bands the device supports. Research the exact signal type and frequency bands that Verizon supports, then research what signal type and bands that your network supports.
Many times I've seen 4G CDMA devices used on other networks and 4G could never be made to work, they were stuck with 3G because the device did not support the 4G type their network uses.
Most devices on other networks but still have 4G can count themselves lucky.

Thanks for your reply,
I flashed this rom (CM13) ; http://forum.xda-developers.com/gal...m-cyanogenmod-13-0-nightlies-verizon-t3269675
my provider is "Djezzy" , and i think its 4g LTE.

RashidVet said:
Thanks for your reply,
I flashed this rom (CM13) ; http://forum.xda-developers.com/gal...m-cyanogenmod-13-0-nightlies-verizon-t3269675
my provider is "Djezzy" , and i think its 4g LTE.
Click to expand...
Click to collapse
You "think", no, don't assume anything, even if your provider uses 4G LTE, if the bands/frequencies of your network are not supported by the device's hardware then it isn't going to work. As I said the first time, you need to do the research to see what bands and frequencies Verizon uses and then do the research to see what bands/frequencies your service provider uses. I mean find the actual values of Verizon's bands/frequencies and the actual values of your networks bands/frequencies, you need to compare them to see if the use the same bands/frequencies, not just whether its 4G or LTE or not. Do you understand what I'm saying?
Also, their may be radio/modem incompatibilities, the radio modem is part of the stock firmware that remains on the device, ROMs are just the system partition and not the whole operating system, software that is under the ROM is still the software the device came with or had before you flashed a custom ROM.
I DO NOT PROVIDE HELP IN PM, KEEP IT IN THE THREADS FOR EVERYONE TO SHARE

Related

[Q] EDGE Network in my phone

I got a Tmobile sensation and I m using in Peru, for some reason the network line is in EDGE, or 2g it is the way we can change, the sim card work in 4g in another phone, some body can help me.
check your network settings and see if your running tmobile. maybe att?
Isnot working
Still under 2g, I read I need do something to activate the 850 HSPA in the cellphone.

HTC one S EDGE speeds

Herro! first time poster, long time lurker! i searched around, and couldn't really find a similar problem.
I got an HTC one S from Fido, unlocked it, and i've been trying to use it on Bell. I tried several different APN's until one finally worked...but only EDGE speeds! It's also draining my battery extremely quickly. also, when i put my bell sim card inside, preferred network mode changes to WCDMA instead of HSPA (like on the fido sim).
why is this happening? i was told a fido phone would work on bell with no problem. why no 4g speeds?
thank you and i appreciate the responses in advance
HSPA uses WCDMA, so that makes no sense... Under preferred network you should have WCDMA only, 2G only, or WCDMA preferred if I recall correctly as I'm not on stock HTC rom atm so can't check. Are you getting an "E" signal indicator or are you just getting a slow connection? What does it say under About phone>Status>Mobile Network Type?
Set it to Auto mode in the network settings.
frdd said:
HSPA uses WCDMA, so that makes no sense... Under preferred network you should have WCDMA only, 2G only, or WCDMA preferred if I recall correctly as I'm not on stock HTC rom atm so can't check. Are you getting an "E" signal indicator or are you just getting a slow connection? What does it say under About phone>Status>Mobile Network Type?
Click to expand...
Click to collapse
yeah, all the tech support i've talked to said it makes no sense either . i get the same outcome whether i put it on WCDMA only or GSM/WCDMA auto. when i do the speed test, it always comes out under 1 mb/s. it actually has the 4G symbol up, but the speed isn't there.
mhmm, it switches between UMTS and HSDPA.
If you have UMTS and HSPDA under status its working, and those are also what connection you're really on. If you always have a 4g icon on status bar it seems like your carrier has modded the software like T-Mobile USA does so it always shows 4g no matter what's up in the real world.
Maybe you're not in a good location and that's why you get slow data. Also I have no idea how Canadian carriers work but I'd guess if you're connected to a 850 MHz cell you'll get worse speeds than on a 1700/1900 one. Don't you guys have insane data caps everywhere, perhaps you hit yours when speedtesting?
did you try a new sim from bell

[Q] How to get 3G/4G with unlocked Blaze on AT&T

I bought one of these phones, rooted it, unlocked it, and installed CM9. I love the phone and OS, but I cannot get the 3G/4G to work on AT&T. Any ideas?
Yeah. The data network is incompatible. Different frequency.
Sent from my SGH-T769 using xda premium
Yeah I think all you can get is 2G (edge) on AT&T with the blaze.
I can say from first hand experience that the blaze works great with AT&T's 3g service. I bought this phone last week, unlocked it, and swapped in the sim from my old Aria and have been using it with CM10 ever since. Data speeds are around 3 to 6 Mb/s down and 1 Mb/s up, and voice and text messaging works fine.
For a more technical answer, AT&T uses the 850 mhz and 1900 mhz frequencies for UMTS (3g), and T-mobile uses 1700 mhz and 2100 mhz frequencies. The blaze supports UMTS on all of these frequencies so there are no technical roadblocks to using this phone with AT&T. http://www.phonearena.com/phones/Samsung-Galaxy-S-Blaze-4G_id6824
As for your problem of not getting 3g working, I had similar issues when first switching the sim card (especially on the stock rom). Check that your APN matches the one your old phone was using. On the stock rom, the phone did not auto detect the correct APN and this caused the 3g to not work. CM10 detected the correct APN right away though. Also, try turning data off and on or even rebooting the phone once you've checked your network settings.
I sold my other phone and no longer have it. Please confirm your APN settings, and how do I change them?
The blaze has all the frequencies necessary for it to do HSPA (3G/4G) on AT&T's networks.
You'll likely want to change the APN. On CM9/10, go to Settings -> Wireless & Networks + More... -> Mobile Network Settings -> Access Point Names.
I was careful in selecting this specific phone because of its compatibility with AT&T HSPA bands. I have tried the suggested tweaks to the APN settings within both CM9 and CM10, but I still get no visual notification that the phone is operating in 3G or 4G mode. The areas in which I have used the phone consistently provided 3G and/or 4G coverage consistently with my prior BlackBerry 9860.
Any additional tips/tricks would certainly be appreciated. I know this phone is capable of so much more than it's providing me at this point.
nellans57 said:
I was careful in selecting this specific phone because of its compatibility with AT&T HSPA bands. I have tried the suggested tweaks to the APN settings within both CM9 and CM10, but I still get no visual notification that the phone is operating in 3G or 4G mode. The areas in which I have used the phone consistently provided 3G and/or 4G coverage consistently with my prior BlackBerry 9860.
Any additional tips/tricks would certainly be appreciated. I know this phone is capable of so much more than it's providing me at this point.
Click to expand...
Click to collapse
have you tried running a speed test to see if maybe it's just that the icon isn't coming up?
That is why it was called the "Merger Proof Phone"

AT&T LG G3 850 Unlocked - Won't give 4G speed

Hello guys
I tried searching for this problem but got nothing that would help, so am posting here.
Issue:
I recently bought LG G3 from someone. The phone is unlocked to work on all networks (AT&T branding on the rom exists though). I am using it outside of USA and it works fine. However I am unable to get 4G speed on my 4G enabled sim. I tried this sim on other phones, and other sims on mine. It is evident that it's my phone that is not supporting the 4G speed, despite showing the 4G logo up top, when data is enabled.
Things I've checked:
I have checked the bands (1800) that my model support and verified it with my network to confirm that it should run their 4G service.
The phone is not rooted.
The sim is functional and has no lock on it.
Checked with hardware checker apps to confirm that my phones supports these bands.
I am not sure if it should root it, or what. I would really appreciate your guidance on the matter.
you need u-sim and 4g data plan for make 4g work, check if u have all of this.
Hello
Yup, as mentioned in the details, I all of that.
Make sure ure apn is for lte or 4g i got stuck with a old apn from my provider once and only edge speeds

Note 5 N920P Network help

Hello Guys.
I am atin from india.
I purchased Imported note 5 N920P (sprint) which is gsm and cdma
Now i am unable to use 4g data services on the phone.
when i insert My gsm card in the phone , i see following NETWORK MODES
1. CDMA
2. LTE / CDMA
3. GSM / UMTS
4. AUTOMATIC
I have selected automatic.
my phone gets network and i can make n receive calls.
but can not use my 4g data service.
however 3g service works , and i can see 3g written on top.
where as in my indian note 5 , when i use 3g , its written H+ . and when using 4g , its written 4g on top
But in imported n920p , 4g does not work and 3g works .but does not show h+ sign.. instead , shows 3g sign
Its running on android 6.0 , when i tried to update it , it says "Device has been modified in unauthorized way. try update via smart switch on pc or take to service center"
please help me on using data services on this phone in India and also can anyone guide on why its not getting update?
atin_garg said:
Hello Guys.
I am atin from india.
I purchased Imported note 5 N920P (sprint) which is gsm and cdma
Now i am unable to use 4g data services on the phone.
when i insert My gsm card in the phone , i see following NETWORK MODES
1. CDMA
2. LTE / CDMA
3. GSM / UMTS
4. AUTOMATIC
I have selected automatic.
my phone gets network and i can make n receive calls.
but can not use my 4g data service.
however 3g service works , and i can see 3g written on top.
where as in my indian note 5 , when i use 3g , its written H+ . and when using 4g , its written 4g on top
But in imported n920p , 4g does not work and 3g works .but does not show h+ sign.. instead , shows 3g sign
Its running on android 6.0 , when i tried to update it , it says "Device has been modified in unauthorized way. try update via smart switch on pc or take to service center"
please help me on using data services on this phone in India and also can anyone guide on why its not getting update?
Click to expand...
Click to collapse
You need to find out what lte bands your carrier uses. And make sure they are comptible with the sprint varients lte bands.
TheMadScientist420 said:
You need to find out what lte bands your carrier uses. And make sure they are comptible with the sprint varients lte bands.
Click to expand...
Click to collapse
If what I've read is correct, Sprint Note 5s have the same hardware and radio band capability as the international version. So a hack or something should be possible. But how or what is way beyond me.
sinisin said:
If what I've read is correct, Sprint Note 5s have the same hardware and radio band capability as the international version. So a hack or something should be possible. But how or what is way beyond me.
Click to expand...
Click to collapse
Next would be to make sure your apn is correct
thanks for replying guys.
unauthorized firmware was loaded. so now it gets FRP lock .
Now i want to flash its stock firmware via odin, so i can use it again./
- does flashing it to stock n920P firmware will unlock the device? or it will remian sim unlocked?
- where can i find stock firmware?
TIA

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