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[Q] Sim Unlock for use in Mexico's Telcel's Network

Hi everyone, so i have a verizon galaxy s 3 and I moved to mexico city from LA. i was going to try the sim unlock method that is posted on the development forum but i actually decided to unlock and root the phone first. later i installed the JellyWiz ROM and to my surprise when i inserted the Telcel sim card, it started working.
I later saw that i could make calls/text and received but i had no data at all. i read that i had to input the APN manually so i called telcel and they were nice enough to actually give them to me. after putting the info in, i got a "G" icon and i started to get some data, but it was not 3G and when i drive around town, i only get data sometimes.
since im a new member i cant port a question in the development forum so im stuck doing it here lol does anyone have any ideas??? im not sure if its just the custom rom that is the problem or the verizon phone doesn't have a compatible 3g radio here in Mexico??? im so lost and running out of hacking talent here hahahaha i put in the

Just to let you know this is where all questions go. Also my guess is Verizon probably has different 3g towers.

Aloja search tty searching for the correct modem try to find a modem for your device that is similar to international version XXDLID
This is a total modem issue I suggest look for the iusacell modems they work on wCDMA and CDMA to telcel has no CDMA any more
Or go to telcel and buy the new usim with 4glte that ads all connectivity support
Sent from a galaxy s3 far far away

Cozumel?
I too am looking to use a local SIM while traveling to Cozumel. I am running CleanRom 5.0 which is based on VLBK1 JellyBean Leak3.
What do I need to do to get data access while in Cozumel?

Does the new JB update bring unlocked 3G GSM?

I've read that the update will bring new global roaming capability, so has anyone tried to stick a GSM SIM into the phone yet? Does the new JB update bring unlocked 3G GSM?

No, it does not. I updated to 4.1.1 bone stock and got it to register on T-Mobile's network, but there is no way to change APN's, so data and text/mm do not work.
Now, before the update you could root and get a program to add in the APN of whichever network you wanted... folks (including myself) have had it on AT&T and T-Mobile's GSM networks, albeit without WCDMA ("3g"). Check out http://forum.xda-developers.com/showthread.php?t=1895684 for progress on getting WCDMA working on the 1900 band. The phone works on the 2100 band out of the box, but no US carrier uses that for WCDMA.
Okay, that said, post-update, I am sure the same APN tricks that worked pre-update, will work now, but sadly one has to be rooted to do that. Attached are two screenshots from while I was farking about with it.

Why not root, then? No disadvantages that I can see
Sent from my SCH-I535 using Tapatalk 2

I like how they're legally supposed to have it unlocked but still, here we are a half a year later.

ac21365 said:
No, it does not. I updated to 4.1.1 bone stock and got it to register on T-Mobile's network, but there is no way to change APN's, so data and text/mm do not work.
Click to expand...
Click to collapse
To be honest, I'm amazed that VZW is allowing you to use another carrier's GSM SIM at all without some sort of unlock code (since this is the case with most phones sold in this country).
I assumed that their "Global Roaming" capability meant that you can take your SGS3 with the VZW SIM to countries (e.g. everywhere other than the USA) that only have GSM (WCDMA/HSDPA) and pay Verizon's extortion (roaming) fees. Maybe the lack of unlock is due to the fact that the phone's primary radios are LTE and CDMA?
If someone can confirm that rooting the phone will allow you to change the APNs it would be greatly appreciated. My family is vacationing in Costa Rica this winter. I've already acquired a couple of unlocked AT&T phones that we plan to use with local prepaid SIM cards, but it'd be nice to be able to have the option of using my I535 there as well.
Thanks!

gm2racer said:
If someone can confirm that rooting the phone will allow you to change the APNs it would be greatly appreciated. My family is vacationing in Costa Rica this winter. I've already acquired a couple of unlocked AT&T phones that we plan to use with local prepaid SIM cards, but it'd be nice to be able to have the option of using my I535 there as well.
Thanks!
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=1809314
Yep, had it on T-Mobile and AT&T (GSM only) here in the states, and worked great on O2 (with HSPA+ YAY) in Germany. Page 6 for my screenshots of Domestic carriers, page 9 for screenshot of me on O2.

Please post questions in Q&A
Thread moved
Thanks
FNM

Imatoasta said:
I like how they're legally supposed to have it unlocked but still, here we are a half a year later.
Click to expand...
Click to collapse
Its not as cut and dry as that. If you have to root the phone to move carriers technically you are in the wrong. If that is what you mean by unlocked.

Dagger_Prime said:
Its not as cut and dry as that. If you have to root the phone to move carriers technically you are in the wrong. If that is what you mean by unlocked.
Click to expand...
Click to collapse
Actually you are wrong. He is referring to the FCC ruling. And we should not need to root to be unlocked. I think that is the point he was trying to make.

Does the inability to change APN affect only the domestic US carriers or is it true for any country's Sim card you put in for gsm use. (Verizon global phones have in the past operated where domestic sims don't work but international ones do)

systemf said:
Does the inability to change APN affect only the domestic US carriers or is it true for any country's Sim card you put in for gsm use. (Verizon global phones have in the past operated where domestic sims don't work but international ones do)
Click to expand...
Click to collapse
I recently updated to the leaked K3 while traveling on business in the Philippines. While voice and text work, there is no way to add any new APN settings in both GSM/UMTS and Global modes. When clicking on Menu in the APN settings, the only option is to restore to default.
Note that while voice and text do work, there is a notification i the notification menu stating "Non-Verizon SIM: Sorry, this SIM card is not supported. Please..."
I believe that the frequency the carrier runs on is GSM900. Hope that helps clarify things. I spent way too much time trying to get 3G to work over here to no success.

Has anyone just tried using Verizon's Global Data Plan ($25 for 100 MB)? Is the S3 somehow not compatible with that plan?
I'm looking at getting the VZW S3 but I've heard all kinds of things about getting the Verizon S3 to work globally pre/post JB update. I know the local sim rates are much cheaper, but for an occasional traveler this is supposed to be the easy solution.

[Q] Verizon GS3 on NET10?

OK, so I am not an expert here but I know enough to give information that should help answer my question.
I have a Verizon (CDMA) Samsung Galaxy S3 (SCH-I535). I'd like to use this phone with a NET10 BYOD SIM card, but I'm not sure it will work. By all indications, my phone is a world phone that includes a GSM band. I say that because I can scan and attempt to connect to both AT&T and a local cell company that are both GSM services. In other words, I can select GSM/UMTS as a network option and it appears to work.
Trouble is, I don't have access to a GSM SIM, so there isn't any way for me to test this without spending money on the SIM card. SO in a round about way, I want to know if this will work. Can I buy a NET10 BYOD SIM, select GSM/UMTS under "Mobile Networks" in teh settings, and expect phone, text, and data to work?
I'm especially hoping to hear from people with the SCH-I535 Verizon GS3 if you've ever done this.
If this is not possible, is there any other BYOD SIM program that will allow for phone, text, and data in a CDMA Verizon phone? If so, what is it?
Thanks everyone.

If Verizon has not unlocked the phone off their carrier, then it will not work. (If you have the Jelly Bean Update, then its unlocked) If it is unlocked, then your in luck.
Mind you that I dont have this phone. But your phone is capable of ATT networks. Just avoid T-Mobile networks unless you want to be on EDGE.

Clarification
StatusQuo209 said:
If Verizon has not unlocked the phone off their carrier, then it will not work. (If you have the Jelly Bean Update, then its unlocked) If it is unlocked, then your in luck.
Mind you that I dont have this phone. But your phone is capable of ATT networks. Just avoid T-Mobile networks unless you want to be on EDGE.
Click to expand...
Click to collapse
Just to make sure I understand, if my phone is Android 4.1.2, then my phone is automatically unlocked and capable of use with an AT&T compatible SIM? And I suppose that includes the NET10 BYOD SIM, or the Straight Talk BYOD SIM for that matter?

How i Just do it con net 10 And is working but just edge .any suggestions settings to enable 4g ???
Sent from my XT910 using Tapatalk 4 Beta

bump
Hi - I am trying to do the same thing, did you have any success? If so, can I get the details of how you did it?
Thanks!!
amusso18 said:
Just to make sure I understand, if my phone is Android 4.1.2, then my phone is automatically unlocked and capable of use with an AT&T compatible SIM? And I suppose that includes the NET10 BYOD SIM, or the Straight Talk BYOD SIM for that matter?
Click to expand...
Click to collapse

Trying to do the same can anyone help me out?

Datdurtyboi said:
Trying to do the same can anyone help me out?
Click to expand...
Click to collapse
Did you check your song settings? Make sure you have your phone on global mode as well.

[CLOSED][Q] Unlocked Relay getting no signal on a non-TMo carrier

EDIT: No feasible solution found, so I had the device sold. Question closed.
UPDATE ON THE ISSUE: It seems that it would not recognize WCDMA networks (GSM works properly), hence no signal on my WCDMA-only SIM card. Any ideas?
Hello all, new joining the Relay 4G forums
Long story short, so I got my Relay 4G today, but it just wouldn't fully recognize my China Unicom SIM card. Symptoms and information:
1) No signal
2) Correctly displays my carrier's name, but says "emergency calls only"
3) Can search for available carrier networks, including China Unicom, but fails to register on the network - it says "unable to connect, try later"
4) The device has a correct IMEI instead of a generic one
5) Doesn't prompt me to enter SIM UNLOCK CODE when I first plugged in the SIM card
6) SIM unlocking procedures posted in the forum doesn't help - the phone should be unlocked when I bought it
7) It recognizes another SIM card from China Mobile (WTF!!) and works properly
8 ) China Unicom uses the 2100MHz band, which is supported by Relay 4G
So now I'm out of ideas... Any help would be appreciated. Thanks
Sent from Google Nexus 4 @ CM11

See this thread for sim unlock. http://forum.xda-developers.com/showthread.php?p=40835465

croogrog said:
See this thread for sim unlock. http://forum.xda-developers.com/showthread.php?p=40835465
Click to expand...
Click to collapse
...So this phenomenon means this really is SIM-locked? Good, I'll revert to ICS and try unlocking with that method...
One question: why doesn't it prompt me to enter unlock code when I inserted the SIM?

@croogrog It didn't turn out to be that simple... SIM unlock procedures didn't work at all even though I got all the timings right. I think the problem isn't caused by SIM lock... But what can it be?
Sent from Samsung Galaxy Nexus @ CM11

Bump
Sent from Google Nexus 4 @ CM11

More strange symptom: another SIM from China Unicom got recognized quickly after I inserted it. I don't understand this...
Sent from Google Nexus 4 @ CM11

If other SIMs are working and you are able to call someone your phone was unlocked when you got it.
If your SIM isn't working it could be that you need a new one from your provider.
I had that problem years ago. My phone was too new ...or my card too old.
SGH-T699 (Relay 4G) Talk with a little Tapa

C3POID said:
If your SIM isn't working it could be that you need a new one from your provider.
Click to expand...
Click to collapse
Hmm, my not-working SIM is bought just days ago... I'll go to my carrier's deck and see if they could swap me a new card.
Sent from Google Nexus 4 @ CM11

AndyYan said:
I'll go to my carrier's deck and see if they could swap me a new card.
Click to expand...
Click to collapse
Good luck.

AndyYan said:
Hmm, my not-working SIM is bought just days ago... I'll go to my carrier's deck and see if they could swap me a new card.
Sent from Google Nexus 4 @ CM11
Click to expand...
Click to collapse
Where did you buy the phone from?

gtmaster303 said:
Where did you buy the phone from?
Click to expand...
Click to collapse
From a local importer at TaoBao (China's equivalent of eBay).
UPDATE ON THE ISSUE: I changed my SIM card for a new one at my carrier's but still won't recognize. Adding in the symptom that it can recognize another China Unicom SIM, I guess I can conclude that the problem lies within this particular SIM.
Sent from Samsung Galaxy S Relay 4G @ CM11

AndyYan said:
From a local importer at TaoBao (China's equivalent of eBay).
UPDATE ON THE ISSUE: I changed my SIM card for a new one at my carrier's but still won't recognize. Adding in the symptom that it can recognize another China Unicom SIM, I guess I can conclude that the problem lies within this particular SIM.
Sent from Samsung Galaxy S Relay 4G @ CM11
Click to expand...
Click to collapse
Best test would be to try another carrier sim all together. Not china unicom. See if the phone takes it. That way you will know for sure that it's unlocked and works. Unfortunately, there's no way to check if it's unlocked, other than to test sim cards
My next suggestion would be to consult samsung for a warranty repair, because your phone might be faulty. Or consider asking the seller that you got it from to send you another one. Let us know if you still need help
Sent from my Galaxy S Relay

gtmaster303 said:
Best test would be to try another carrier sim all together. Not china unicom. See if the phone takes it. That way you will know for sure that it's unlocked and works. Unfortunately, there's no way to check if it's unlocked, other than to test sim cards
My next suggestion would be to consult samsung for a warranty repair, because your phone might be faulty. Or consider asking the seller that you got it from to send you another one. Let us know if you still need help
Sent from my Galaxy S Relay
Click to expand...
Click to collapse
1. I checked with a China Mobile SIM and it works. Also, as said before, another China Unicom SIM also works. Only this specific SIM doesn't. It IS unlocked when I purchased it.
2. No way for a warranty - I'm in China and this is a T-Mobile USA device that many local "smartphone gurus" haven't even heard of, let alone "repairing" it.
3. The importer only has one such device in perfect condition (others have plenty of worn and torn), so exchanging is not possible...
I'm thinking of setting up an alternative solution for now...

More update on the issue: even on the China Unicom SIM that got recognized, it wouldn't connect to WCDMA/HSPA+ networks. Did an experiment: I used *#*#4636#*#* to adjust network modes, and when the device is on GSM only / GSM/WCDMA auto / WCDMA preferred, it would receive signal like normal; however, choosing WCDMA only, no signal is received. It seems like the real issue lies within the device after all...
Sent from Samsung Galaxy S Relay 4G @ CM11

...The Relay isn't a WCDMA device.

Even though the relay is a US tmobile device i would still try to contact samsung. They may be able to help you and it can't hurt. This is certainly not the first Relay to leave the US and incur problems...
Sent from my Galaxy S Relay

Jax184 said:
...The Relay isn't a WCDMA device.
Click to expand...
Click to collapse
What? I mean, my carrier has the HSPA+ 21Mbps/42Mbps it supports... What do you mean by it not supporting WCDMA?
Sent from Samsung Galaxy Nexus @ CM11

AndyYan said:
What? I mean, my carrier has the HSPA+ 21Mbps/42Mbps it supports... What do you mean by it not supporting WCDMA?
Sent from Samsung Galaxy Nexus @ CM11
Click to expand...
Click to collapse
If I understand correctly, the network mode menu option for WCDMA in the CM10 ROM is left over from the D2, which is a phone of similar spec which our developers based our ROM on. It doesn't do anything on the Relay.

Jax184 said:
If I understand correctly, the network mode menu option for WCDMA in the CM10 ROM is left over from the D2, which is a phone of similar spec which our developers based our ROM on. It doesn't do anything on the Relay.
Click to expand...
Click to collapse
But it DOES switch network modes... Or so I think, judging from the symptoms.
The first SIM only supports WCDMA(HSPA+), and when inserted, it can find my carrier's network but can't connect. On the second SIM which is compatible with both GSM/WCDMA, I lose signal only when "WCDMA only" is chosen, and under this situation the symptom is same as above. I assume that it can find my carrier's GSM network but not the WCDMA one.
Sent from Samsung Galaxy Nexus @ CM11

Bump in vain. I guess I'll be selling this phone if the issue is really within the phone itself...
Sent from Samsung Galaxy Nexus @ CM11

[Q] No Mobile Data on Sprint Galaxy s5 G900p

Hi guys, I got a samsung galaxy s5 g900p from sprint I bougth it unlock from a store, right now i am in Venezuela, the sim card works fine i can do call and send messege, but for some reason i can not used any mobile data.
I had follow diferents tutorials online (change the APN, change network to gsm-umts and even change some system folders) and none of that worked. Im running right now android 5.0 G900PSPT2BOD3 with root acces.
I really really need some help here please...
PD: sorry for my bad writting

alex_agx said:
Hi guys, I got a samsung galaxy s5 g900p from sprint I bougth it unlock from a store, right now i am in Venezuela, the sim card works fine i can do call and send messege, but for some reason i can not used any mobile data.
I had follow diferents tutorials online (change the APN, change network to gsm-umts and even change some system folders) and none of that worked. Im running right now android 5.0 G900PSPT2BOD3 with root acces.
I really really need some help here please...
PD: sorry for my bad writting
Click to expand...
Click to collapse
First of all i am certainly no expert but this might help. From the way i understand it the sim is for LTE and you would have voice and 3G if no sim existed. When you unlocked it
you allowed the phone to go international. How ever if the sim card that is in the phone is a US sim it will not work out side US. Since you said that you are in Venezuela right now
and did not say where you purchased the phone can i assume that you might have a US sim in it. That being said pull the sim out and see if the phone will now give you 3G.
If it does then get a new sim from where you are.

it wouldnt be cdma at all, just gsm, and your data issue is likely all due to the APN settings. Sounds like youre international unlocked, which is good, but your apn settings are likely messed up. I see that you are rooted, but are you on the stock ROM?

still no solution for DATA on gsm device