Related
I've personally experienced the differences with SIM cards.
Having been with T-Mobile (since Voicestream) I've gone through tons of SIM cards throughout the years. For the heck of it every time I got a new phone I just swapped to the new SIM.*
Ok so let's talk present day. I've noticed that the SIM cards have been changing. The large gold surface area is now small etc...
* Recently (past few years) before all the smart phones started to pop up like crazy, I was using the same SIM card with several devices. I remember getting crappy data speeds at one point then I swapped out to a newer SIM and it was night and day.
Now it looks like the newest SIM's are marked with an, "activate by," date. I wonder if there are limits to how many times that SIM can connect to the network?
Anyhow, anyone with advanced knowledge about SIM's, your input would be greatly appreciated. I find it a pretty interesting topic due to my personal experience. There has to be something with the changes that do effect the data speeds for example.
Below are some pics...
"SO FOR THOSE WHO ARE HAVING CONNECTION ISSUES, COULD IT BE PERHAPS YOUR SIM?"
the reps at a store just told me to makr sure I used the new sim card they gave me because only their new ones allow for the 4g network
they have a diff design hatched in the gold
but u r correct in noticing the difference
sent from my G2X with no regrets
rich2thad said:
the reps at a store just told me to makr sure I used the new sim card they gave me because only their new ones allow for the 4g network
they have a diff design hatched in the gold
but u r correct in noticing the difference
sent from my G2X with no regrets
Click to expand...
Click to collapse
That's odd, I'm still using my sim from my old G1 and I hit 9018kbits when I did a speed test a couple of days ago.
Sent from my LG-P999 using XDA Premium App
rich2thad said:
the reps at a store just told me to makr sure I used the new sim card they gave me because only their new ones allow for the 4g network
they have a diff design hatched in the gold
but u r correct in noticing the difference
sent from my G2X with no regrets
Click to expand...
Click to collapse
Interesting as figured. Thanks for your input.
well in their defense , they said new sim card in respect to at some point in time they changed how thw sim cards were made and was concern if i had an old one seeing as I've been with then for years...
but
ugh I wish I got speeds like that northern cali speeds suck ...
in sacramento I get maybe 1mb if I'm lucky usually around 0.85mb/s
sent from my G2X with no regrets
I just switched sim cards one day ago. I switched to the one that came with the phone. I notice no difference at all. The old one had been in my vibrant for about 7 months. T mobile rep told me that the only difference in sims(size of gold area) is how many contacts they will hold. I do not believe that for a minute. I just sold my Nexus One and it would not recognize the sims with the smaller gold contact area. I have been told so much BS from CS and tech reps at tmobile that I rarely believe any thing they say at this point. I am getting a replacement phone which should arrive on Monday. I just hope that it is free of most of the issues that my present one has or what I have seen listed in these threads. I really really like this phone just hope either it is issue free or the issues are addressed by LG right away if not I will send back and cancel the order. This phone has potential to be THE Beast of the the Bunch!!!!
I just got a new sim card with smaller gold area for my N1 and it works fine.
Sent from my Nexus One using Tapatalk
davehasninjas said:
That's odd, I'm still using my sim from my old G1 and I hit 9018kbits when I did a speed test a couple of days ago.
Sent from my LG-P999 using XDA Premium App
Click to expand...
Click to collapse
I'm also using one that I got with my G1 and am pulling down almost 6mb myself. The TMo rep stated that my SIM will work just fine, and it does. But if I notice slow speeds, I should just activate the new one and put that in.
Side note, anybody know how to activate it to your account without having to go through the completely clueless IVR? Perhaps through their website?
Fernanernie said:
Side note, anybody know how to activate it to your account without having to go through the completely clueless IVR? Perhaps through their website?
Click to expand...
Click to collapse
Closest I know of is doing a chat session with a rep through their web site. I have only swapped SIMs once when I switched to the Nexus One and had the 3G connection issues (didn't have them with the G1). Went smooth and had no problems.
I work at a retail store and the newest SIMs have a matte white finish to them and have the numbers "5.0.0.1" on the bottom. I don't know if it gets you faster speeds , but generally these ones fix most customers connection problems.
Sent from my LG-P999 using XDA Premium App
I'm having super nasty reboot issues, but I also have the SIM from my T-Mobile Wing still so I'm going to go swap it tomorrow and see if it at least helps.
I just chatted with T-Mobile customer rep online and she swap for me in 5 mins. Painless process.
Been curious lately myself. To Tmobiles reps surprise when I told them. (After they said I wouldnt have 3g or 4g) I told them I am still using my simcard from 2003.. from my Nokia 3650! I use it in my G1, I have used it in my HD2 with Android and Better windows rom for HSPA (4g) just fine..
Reps didnt really believe I am using that old of a sim card. I am however. Data speed seems fine to me. Wouldnt mind being proven wrong if a new sim style has faster speed.
I will believe the new sim cards have larger space for contacts tho.
The main reason I think there are new sim cards and they are being pushed, is due to sim cloning. Older sim cards could be cloned so you could put multiple numbers on 1 sim, or just clone it to prevent swapping. Newer sim cards however, cant really be cloned. So if you want my thoughts, its not about the data, its about the security.
That's a good observations.
Sent from my LG-P999 using xda premium
rich2thad said:
well in their defense , they said new sim card in respect to at some point in time they changed how thw sim cards were made and was concern if i had an old one seeing as I've been with then for years...
but
ugh I wish I got speeds like that northern cali speeds suck ...
in sacramento I get maybe 1mb if I'm lucky usually around 0.85mb/s
sent from my G2X with no regrets
Click to expand...
Click to collapse
I am in Northern Ca too, and I am getting between 2.5-4M down, and 1.1-3 Up
As far as how GSM works i know the carriers network information is on the sim card not the phone. Hence why you can swap GSM carriers on your phone at any time. The sim card carries the prl which instructs the phone what towers to use. So getting a new sim card once or twice a year would seem like a good idea.
This is my guessamation lol
Sent from my LG-P999 using xda premium
Older SIM cards, unlike the newer ones, have an activation limit (usually ~90,000 or so). Once this limit is reached, the SIM card will not connect to the network anymore. The 'activation' event occurs each time your modem connects to a new cell radio on the towers. This wasn't a large issue with GSM/EDGE because they had a larger cell radius and your phone would use data less. With HSPA(+), your phone can make hundreds of connections in a day, sometimes thousands.
JaiaV said:
Older SIM cards, unlike the newer ones, have an activation limit (usually ~90,000 or so). Once this limit is reached, the SIM card will not connect to the network anymore. The 'activation' event occurs each time your modem connects to a new cell radio on the towers. This wasn't a large issue with GSM/EDGE because they had a larger cell radius and your phone would use data less. With HSPA(+), your phone can make hundreds of connections in a day, sometimes thousands.
Click to expand...
Click to collapse
Never seen or heard this one before. I mean using it since 2003 to now. I would be sure over my time and travel I wouldve connected that much and more.
First off - there is supposedly a problem for Wifi calling and the G2X and the TM9177 sim card,
many seem to find that switching to an older TM9073 (or TM9035) SIM card fixes the wifi calling problem.
see: http://support.t-mobile.com/thread/10103?tstart=0
see: http://support.t-mobile.com/message/68263
I had the older TM9073 which worked great for 2g/3g/HSPA+/wifi calling- but it died on me while traveling for work, and I was fortunately able to stop by a T-mobile store, and they gave me a new SIM --- the TM9177 --- which works fine for 2g/3g/HSPA+... but wifi calling is a mixed bag, it works on some ROMS, but not otthers.. whereas before the TM9073 works for all ROMs.
arvonn said:
First off - there is supposedly a problem for Wifi calling and the G2X and the TM9177 sim card,
many seem to find that switching to an older TM9073 (or TM9035) SIM card fixes the wifi calling problem.
see: http://support.t-mobile.com/thread/10103?tstart=0
see: http://support.t-mobile.com/message/68263
I had the older TM9073 which worked great for 2g/3g/HSPA+/wifi calling- but it died on me while traveling for work, and I was fortunately able to stop by a T-mobile store, and they gave me a new SIM --- the TM9177 --- which works fine for 2g/3g/HSPA+... but wifi calling is a mixed bag, it works on some ROMS, but not otthers.. whereas before the TM9073 works for all ROMs.
Click to expand...
Click to collapse
+ 1 my new SIM didn't like wifi calling at all... but switched to the TM9073 and never had a problem since on any rom.
Sent from my HellfireKindle using Tapatalk 2
Was talking to the T-mobile rep about the gps issue and not locking in within secs as it did the first day of purchase. Went through some steps then he informed me that I have the older 2G Sim card and I needed to go to a Tmobile store to upgrade my sim card to the new UICC 3G sim cards. This is the first I ever heard of this as he said they were release back in January. Called the local T-mobile store and they confirmed it. So now i'm going to head to the store and see if it makes a difference. Wanted to know if anyone else has heard of this?
Jeffrey G: Now, I've noticed that you are still using an older version 2G SIM, though you have now been using 3G style phones.
_Jeffrey G: Last January we came out with a new version SIM card, called UICC 3G, because we've seen a lot of the 3G phones acting up with the older SIM cards.
Ange: how do you know the difference between a 2g Sim and 3G style sim
_Jeffrey G: Things like, freezing up, losing signal, not getting data signal, rebooting and bogging down.
_Jeffrey G: Well, some of the UICC SIM cards show UICC on it, though not all batches do. We can see it on the network side as it is listed as what type you are using.
_Jeffrey G: If you go to locator.t-mobile.com you can find the closest T-Mobile Corporate Store.
_Jeffrey G: Labeled with a pink "T" icon, there you can trade in your SIM and get the new SIM at no charge. We can even help transfer everything over for you.
Ange: will i still keep the same number
_Jeffrey G: Absolutely!
Soldi3rxx said:
Was talking to the T-mobile rep about the gps issue and not locking in within secs as it did the first day of purchase. Went through some steps then he informed me that I have the older 2G Sim card and I needed to go to a Tmobile store to upgrade my sim card to the new UICC 3G sim cards. This is the first I ever heard of this as he said they were release back in January. Called the local T-mobile store and they confirmed it. So now i'm going to head to the store and see if it makes a difference. Wanted to know if anyone else has heard of this?
Jeffrey G: Now, I've noticed that you are still using an older version 2G SIM, though you have now been using 3G style phones.
_Jeffrey G: Last January we came out with a new version SIM card, called UICC 3G, because we've seen a lot of the 3G phones acting up with the older SIM cards.
Ange: how do you know the difference between a 2g Sim and 3G style sim
_Jeffrey G: Things like, freezing up, losing signal, not getting data signal, rebooting and bogging down.
_Jeffrey G: Well, some of the UICC SIM cards show UICC on it, though not all batches do. We can see it on the network side as it is listed as what type you are using.
_Jeffrey G: If you go to locator.t-mobile.com you can find the closest T-Mobile Corporate Store.
_Jeffrey G: Labeled with a pink "T" icon, there you can trade in your SIM and get the new SIM at no charge. We can even help transfer everything over for you.
Ange: will i still keep the same number
_Jeffrey G: Absolutely!
Click to expand...
Click to collapse
Wish that would have fixed my problems - I got a new SIM with this latest G2x.. It worked fine for 3 days then started the reboot tango just like the 3 before it.
Soldi3rxx said:
Was talking to the T-mobile rep about the gps issue and not locking in within secs as it did the first day of purchase...
Click to expand...
Click to collapse
How can the gps issue be the sim card if it the same one you were using when phone was properly working.
sstang2006 said:
How can the gps issue be the sim card if it the same one you were using when phone was properly working.
Click to expand...
Click to collapse
How can the speed at which the phone acquires a GPS lock be a SIM card issue AT ALL?
I have an older R20 SIM attached and I don't have much problem.
Well GPS will use cellular triangulation to help speed up the initial lock, which can take up to 2 minutes (cold lock vs warm lock).
AGPS uses cellular towers to help narrow down the search. GPS is basically a timestamp signal and satellite position. With multiple timestamps and satellite positions, it can calculate an almost exact position on the planets surface.
Typically GPS units with an active data connection can keep a cache of satellites and their orbits. If you have a rough position via cellular tower triangulation and a timestamp, you can greatly reduce of satellites that are supposed to be in the sky above and get a quicker fix on a location.
So technically, if your cellular is screwed up, you won't get a quick fix like most of us are used to (under 10 seconds). Before AGPS and all the new techniques, 2 minutes was normal under cold conditions.
Today, using CM7 #38, I used my GPS to try to navigate to a place I had never been. I was in the outskirts of a major city and had 3G/4G signal. I watched the clock for an exact fix. 2 minutes.
So either the AGPS isn't downloading and pre-caching information properly or there is a problem with triangulation to begin with... or both.
Some people have claimed that the default AGPS data servers are bonked and thus changing to another GPS server has yielded quicker response times. Others say the SIM has helped. Others have said their rom has helped (which may use different servers by default). I don't know. But anything is possible.
I do know that I was getting pretty quick locks when I first got the phone running stock. Perhaps it is another driver issue (Froyo vs GB). I don't think it is a hardware issue though and the locks, once locked, work pretty well and accurate. I'm leaning toward a software issue since there seems to be a few of them we are aware of... especially driver related.
BTW I'm using the SIM that came with the phone just for good measure.
Ok so let me clear a few things up here. I work in Tech Care/PDA Support and a new sim will not fix software slowness or lagging when switching programs. The only time I ever recommend a new sim is if there are drop calls, intermittent texting failures, data connection drops that are consistent, etc. This also isn't going to give you a faster data speed.
It doesnt hurt to make the switch, but that rep gave unrealistic expectations.
Is anyone else having issues with their Wifi-Calling on T-mobile?
I find that the wifi-calling app gets stuck at the stage there the app reads: "Enabling..."
* This is on either stock unrooted GB ROM or Xboarder's tweaked GB.
* Happening on two different routers in two different homes, different ISPs. Both
were working previously.
* I noticed this recently upon returned home from a long trip. During the trip, I had good cell coverage and didn't need the wifi-calling function anyway.
* T-mobile CSR reports an outage:
_Irina M: Ok, we are experiencing an issue with the G2X not able to establish a WIFI connection.
_Irina M: I will post the outage for you.
_Irina M: EFFECTIVE DATE: 11/7/11 OUTAGE TYPE: UMA...................................
MARKET AFFECTED: All
...................................
CUSTOMER IMPACT: G2X Cannot Activate Wifi Calling
T-Mobile subscribers may be reporting issues with the G2X encountering errors when attempting to activate Wifi calling. The device may show "enabling" but never connects.
Please Note: This issue is pending a software update but until this is released customers can upgrade to an UICC SIM card to resolve this issue.
MARKET/SERVICE IMPACTS TO: Global / Wifi Calling
CAUSE: n/a
* Despite this answer from t-mobile, I think it might be related to my recent change of a SIM card. I was having another unrelated issue and CS suggested I get a new SIM. The new SIM did not solve my issue. But now I have a new one. I did get a new SIM today, but this did not solve my problem. For the life of me, I cannot find my old SIM to reactivate.
Any one having the same issue? Can anyone test their phones to see what is what? Thanks.
11/18/11... I tested using a sim card from an Sgs4g with working 4g and wifi-calling. With this SIM in my g2x, wifi-calling was working again. It appears to me that my newer SIM cards x 2 break wifi calling.
If only I had my old card. Ironic that there was nothing wrong with that card in the first place.
I don't use wifi calling but my wifi does cut out and stop working randomly. Right now I'm only showing one bar even though I'm Lees than 10 ft from my router. This phone seems to have random wifi issues and I remember reading something online conforming it, but I don't remember where.
Sent from my G2X
I have that problem (stuck at "enabling") a couple of times a month. I generally take that as an indication that it's time for a reboot, and so far a reboot has always fixed the problem for me.
No I'm experiencing it too. It was working last night I know (at home) and it was working this morning.
My GF just called me at work, which was odd... and this makes sense. My WiFi Calling is stuck at "Enabling" also.
Tmobile has gotten rid of WiFi Calling on the newer phones because they are moving to a "new" standard. The new standard requires a new SIM card. WiFi Tethering is also not working out of the box.
Something is strange.
I even went into Apps and did a Force Stop and cleared cache and tried to launch it again... it just closes and never enables.
*UPDATE*
Now its working.
I never have connection problems, but the sound quality is terrible. The person on the other end sounds real robotic and choppy. It was like this even on my blackberry.
Now its saying invalid SIM. Sweet.
G2x - 2.3.7 CM7
Transformer - 3.2 Revolver OC/UV
No problem here just try it one minute ago.
Sent from my LG-P999 using XDA Premium App
See my update above. I think T-Mobile has changed the sim cards but not yet updated the software. If anyone is using wifi calling, then hold on to your cards until they fix this.
Sent from my LG-P999 using xda premium
substanceneil said:
See my update above. I think T-Mobile has changed the sim cards but not yet updated the software. If anyone is using wifi calling, then hold on to your cards until they fix this.
Sent from my LG-P999 using xda premium
Click to expand...
Click to collapse
I have never used it but decided to test it because of this thread. Works great on weapon 3.0.
I bought an old sim card off eBay but haven't activated. May try it out. I'm on CM7 and it hasn't worked in days.
G2x - 2.3.7 CM7
Transformer - 3.2 Revolver OC/UV
I am using an old similar card, wifi calling working fine, but I can't use Bluetooth.
Nightly 199, faux cm kernel.
Bluetooth and Wi-Fi calling should not be affected by your SIM card in any way on the G2x.
You need a gsa sim. These sim cards are made in the usa. Yea America!!!! **** yeah.
No but on some real talk the sim cards made in America are good quality.
India, China, and Mexico made ones do not support wifi calling. Plus they go out every month
Sent from my LG-P999 using XDA Premium App
Ninosmaxima said:
You need a gsa sim. These sim cards are made in the usa. Yea America!!!! **** yeah.
No but on some real talk the sim cards made in America are good quality.
India, China, and Mexico made ones do not support wifi calling. Plus they go out every month
Sent from my LG-P999 using XDA Premium App
Click to expand...
Click to collapse
Gba sim*** check your apn settings. Or try clearing the wifi calling app data
Sent from my LG-P999 using XDA Premium App
I swapped my wife's sim card (about one year old) with my newer one. I asked customer care to reprogram our phone numbers. Either card supports wifi calling in the Galaxy S 4g. The old card supports wifi calling in my g2x.
When I get to an area of known good coverage, I will run a speedtest to see if I lose any speed using the older card.
Sent from my LG-P999 using xda premium
Where and how to find old simcard?
I called Tmobile service yesterday. 3 different rep told me that I need newer sim which support 4G and wifi calling and offered to upgrade the new sim card for 20 bucks. I got mad and asked to talk with mananger. Finally a tech rep honestly told me that there is issue with wifi calling for G2X and their engineers are working on the fix, but no date of completion yet.
She sent me to a tmobile store to get a new sim card, and said it might solve the problem, but not sure 100%.
I went to the store, change new sim card at no charge. but the wifi calling still not working.
now, I saw people put the comment in this forum that we need old sim card. How do I indenfify the old sim card? what number? or serial number ect???
Can I get it from ebay?
Thanks
Alpharetta.
alpharetta said:
I called Tmobile service yesterday. 3 different rep told me that I need newer sim which support 4G and wifi calling and offered to upgrade the new sim card for 20 bucks. I got mad and asked to talk with mananger. Finally a tech rep honestly told me that there is issue with wifi calling for G2X and their engineers are working on the fix, but no date of completion yet.
She sent me to a tmobile store to get a new sim card, and said it might solve the problem, but not sure 100%.
I went to the store, change new sim card at no charge. but the wifi calling still not working.
now, I saw people put the comment in this forum that we need old sim card. How do I indenfify the old sim card? what number? or serial number ect???
Can I get it from ebay?
Thanks
Alpharetta.
Click to expand...
Click to collapse
The newer SIM will say TM9073. You gotta take it out and look at it.
e4e5nf3nc6 said:
The newer SIM will say TM9073. You gotta take it out and look at it.
Click to expand...
Click to collapse
OK.. I resolved the problem. I had TM9073 and it did not work with MUI ROM.. so I changed to newer sim card TM9102, and it still not work for wifi calling. I then read about the issue with MUI ROM. the wifi calling only work with CM7 ROM. So I reflash G2x with CM7, and still use TM9102 sim..
It takes 5 minutes to enable the wifi calling feature.. but it works now... so first thing first.. you need to make sure you have the correct ROM... and then sim.
Wifi calling on MIUI has only worked for me 3 times. That was on the first boot. I had the newer sim card. Just recently bought a older sim card and now wifi calling works for MIUI every time!!
alpharetta said:
OK.. I resolved the problem. I had TM9073 and it did not work with MUI ROM.. so I changed to newer sim card TM9102, and it still not work for wifi calling. I then read about the issue with MUI ROM. the wifi calling only work with CM7 ROM. So I reflash G2x with CM7, and still use TM9102 sim..
It takes 5 minutes to enable the wifi calling feature.. but it works now... so first thing first.. you need to make sure you have the correct ROM... and then sim.
Click to expand...
Click to collapse
It is the TM9073 Sim that is working properly on all other roms. The TM9102 is the Sim having problems with WiFi.
Hello everyone!
First time poster over here in the HTC Ox forums!
My fiance has an ATT HTC Ox. She is 100% stock and doenst want to root and play with ROMs.
Over the past week or so she has not been receiving calls or text messages. A reboot fixes it, but that isnt really an acceptable solution. IT happens randomly it seems.
i did a search and saw some people having similar problems, but not any solutions.
Anyone got any ideas/help they could provide?
We're going to go to ATT to get a new SIM tonight. But any help would be greatly appreciated.
I believe it's a problem with the new LTE staying connected. Try turning it off and setting connection to WCDMA preferred.
Sent from my HTC One X using xda premium
Before going out fo your way for a new sim card, if you have a phone with the same size of sim card you can just swap the two and see if its a device issue or just the sim card. But when I worked for Rogers the sim card was typically the problem for that kind of problem. That said, I had a similar problem after rooting my O XL that seems to have been corrected by just toggling LTE off for GSM, reboot, retoggle LTE back on, and restart. Dial *#*#4636#*#* under Phone Information set preferred network type.
Hi All,
I have been using Moto G for 2 weeks now. Aboslutley no notable issues till now but for one.
I have Airtel GSM connection in India. And when i am switched to 3G Network, I often notice N/W issues like my calls take time to get connected, 3G Internet goes slow and sometimes when i try to check my balance using *123# or *121*2# , I get this error message - "Connection Problem or Invalid MMI Code".
This never happens if i am switched to 2G Network. Happens only when i am in 3G.
Co-Incidently I had this problem in my older Samsung Galaxt SL i9003 too.
Kindly let me know if anyone else in India is facing this issue or can it be because of my device or my SIM.
P.S i happened to cut my normal SIM to Micro Sim to fit it into Moto G and my SIM is approx 4.7 years old.
It should be your sim card problem.. Try with some other sim and other networks like Vodafone
Sent from my XT1033 using XDA Premium 4 mobile app
Problem
kunalkumar2611 said:
Hi All,
I have been using Moto G for 2 weeks now. Aboslutley no notable issues till now but for one.
I have Airtel GSM connection in India. And when i am switched to 3G Network, I often notice N/W issues like my calls take time to get connected, 3G Internet goes slow and sometimes when i try to check my balance using *123# or *121*2# , I get this error message - "Connection Problem or Invalid MMI Code".
This never happens if i am switched to 2G Network. Happens only when i am in 3G.
Co-Incidently I had this problem in my older Samsung Galaxt SL i9003 too.
Kindly let me know if anyone else in India is facing this issue or can it be because of my device or my SIM.
P.S i happened to cut my normal SIM to Micro Sim to fit it into Moto G and my SIM is approx 4.7 years old.
Click to expand...
Click to collapse
get a new micro sim
rr46000 said:
get a new micro sim
Click to expand...
Click to collapse
Are your sure that its because of SIM?
MMI code issue is known to exist on many devices and probably has nothing to do with your sim.
Its better to get a newer micro sim, moto g doesn't like cut sim cards. I had to get a new one, the cut one was simply not detected at all. YMMV though.
adizz4 said:
MMI code issue is known to exist on many devices and probably has nothing to do with your sim.
Its better to get a newer micro sim, moto g doesn't like cut sim cards. I had to get a new one, the cut one was simply not detected at all. YMMV though.
Click to expand...
Click to collapse
Lol.. now u scare me by saying it exists in many devices. So does it mean if it is not becasue of SIM, then do i need to get my Moto G changed?
More to do with android tbh...ur phone's fine
Sent from my Moto G using Tapatalk
adizz4 said:
More to do with android tbh...ur phone's fine
Sent from my Moto G using Tapatalk
Click to expand...
Click to collapse
Apologies but wht do u mean by "Android tbh"
Google
kunalkumar2611 said:
Apologies but wht do u mean by "Android tbh"
Click to expand...
Click to collapse
i mean literally is there no google
tbh means to be honest
many sims which were 4 years or older had some problems (moto g indian thread)
it can be mmi code but i'm not sure then
Actually i had the same problem with my sam y and now on moto g.. my wife has the same issue on her sam s duos.. imo it's the poor 3g network of airtel that causes this issue more than anything else..
Sent from my XT1033 using Tapatalk
It's due to poor network of some service providers. I have 2 sims: Docomo and Idea, Docomo gives me some problem with network connectivity and running USSD codes also but Idea works smooth.