Testing an unlocked phone with activated sim? - Android Q&A, Help & Troubleshooting

Hello, I have a carrier unlocked T-Mobile Galaxy S4 (SGH-M919) and I wanted to have it activated on Verizon wireless because come on, T-Mobile can really be garbage in some areas and I've never had a problem with Verizon.
First of all, there's a lot of controversy over this. Some people say it can't be done. Some say they've done it without a problem. I want to figure this out before heading over to Verizon and wasting mine and anyone else's time.
Would it be possible to test if this works by taking my friends activated sim card from their iPhone and putting it into my GS4? Would this mess with the data, contacts, or anything else with their phone?
Also if anyone has done this please give me some information on how and what I should do to get this going. Thanks!

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[Q] I need some help with my Rooted G2X

So after having this g2x for 2 years now I decided to Root it, all was well, it could access wifi and basically run like a phone without being connected to a plan (I recently upgraded to a Samsung Galaxy S3). Well after rooting it and whatnot my girlfriend broke her ipod touch so I offered to give it to her and to put it on Net10 because my job now sells it. But when I put the SIM card in that's when things kind of went down hill, the phone, whenever I would place a call would start clicking and when I answered it with my phone the clicking continued on my end as well. I called Net10 Customer service and they didn't really help, so I put it back to stock everything except for the recovery menu. Still it doesn't work, the dude said that the t-mobile towers were having problems and that, that was the problem. I don't know if I trust that because my phone plan is with T-Mobile and I was talking with him just fine. So enough about my issues and on to the questions. Are there any Net10 friendly ROMs available and if so what are they? Is it the g2x that's being stupid or is it the network? Also my data stops working after I put in the Net10 APN. Any help would be greatly appreciated. To answer a question that I know some of you might have, yes I'm a rooting/ROM noob but I did it on my Galaxy S3 and it works like a charm. Thank you for your time.
gingerbread will be better

[Q] Verizon-Sprint GSIII

So I looked around the threads on both Verizon, and Sprints side of the fences for an answer to this question and couldn't find any thing.
I have a Verizon Galaxy S3, and my contract with Verizon recently came to a close. I want to switch to sprint due to pricing and other options, but I don't have the money to drop on a new phone at the time, so I have been looking into unlocking the phone to work with Sprint, however I haven't much of luck...
That's when I came to XDA. While I was looking around the forum, I got to thinking.
Is there any possible way that I could take the Sprint version of the Samsung Galaxy S3's ROM, and load it onto my Verizon Galaxy? And has anyone tried this yet?
It's essentially the same hardware, right? To the best of my understanding, the only difference in the phones would be software related according to the carrier.
I am really struggling with this one, and I have witnessed the vast knowledge and great work by this forum before, so I am hoping I'll be able to find the help I need.
-Mortem Obrie
Verizon and Sprint do use the same cdma networks but will not activate each others devices on their network so the answer is no I do not think this is going to be possible for you.
alekurkudi said:
Verizon and Sprint do use the same cdma networks but will not activate each others devices on their network so the answer is no I do not think this is going to be possible for you.
Click to expand...
Click to collapse
Well I did talk to Sprint, and Sprint said they would be willing to activate an unlocked Galaxy. It's just the unlocking process that I am unsure of.

[Q] Trying to use as a tracfone.

I called tracfone to activate a Verizon galaxy s4 I got from a friend who switched att and iphone 5. When tech support tried to activate it they said the phone was locked and I needed to have Verizon unlock the phone.
I cannot get a hold of my friend as he's on a business trip for a week. Is there a way to unlock this myself? or can I only have Verizon do this. And if I can do this myself, will I have quirky setup and need workarounds for use?
My galaxy has a verizon sim card and a 32gb data card. My phone model number is i545 if iirc.
Thanks for any advice.
-=Mark=
rmjohnson144 said:
I called tracfone to activate a Verizon galaxy s4 I got from a friend who switched att and iphone 5. When tech support tried to activate it they said the phone was locked and I needed to have Verizon unlock the phone.
I cannot get a hold of my friend as he's on a business trip for a week. Is there a way to unlock this myself? or can I only have Verizon do this. And if I can do this myself, will I have quirky setup and need workarounds for use?
My galaxy has a verizon sim card and a 32gb data card. My phone model number is i545 if iirc.
Thanks for any advice.
-=Mark=
Click to expand...
Click to collapse
To help you get started with replies quicker I'll say that it is mostly dependant on which firmware you have and also if you have root.
those two factors will allow you to know if you can use any of the unlocking apps by chainVire if they are still around. someone will point it out to you I hope. On the go, can't show you myself. Best of everything in your efforts but read around. I'm sure someone has done it before. Welcome to XDA. I seen that was your 1st Post. Awesome!
That app is for unlocking the sim card. My track phone doesn't need a sim card.
Can I maybe just remove the sim card and have it work? Or do I need the sim card for the s4 to work at all?
Idk why they told you it is locked, all Verizon phones legally have to be carrier unlocked because of their deal with the FCC.
Translated from Calligraphy
Okay, I also remember they asking for an MEID off my S4 and this one only has an IMEI number.
Will this make it not compatible? I don't want to pay to unlock this thing if it won't work with Tracfone afterwards.

[Q] Possible To Use T-Mobile LG-G3 with Verizon PREPAID???

I recently did something similar to this...I brought my Verizon Galaxy S4 over to T-Mobile...works perfectly, Wi-Fi Calling and all.
SO, now I'm REALLY hoping I can take my rooted T-Mobile LG G3 (with unlocked bootloader!) over to Verizon!! Does anyone know if this would be possible? I'd definitely prefer to go with Verizon's PREPAID service on it though if I even can. Anybody have any thoughts on whether or not this should work?
Thanks
calebcabob said:
I recently did something similar to this...I brought my Verizon Galaxy S4 over to T-Mobile...works perfectly, Wi-Fi Calling and all.
SO, now I'm REALLY hoping I can take my rooted T-Mobile LG G3 (with unlocked bootloader!) over to Verizon!! Does anyone know if this would be possible? I'd definitely prefer to go with Verizon's PREPAID service on it though if I even can. Anybody have any thoughts on whether or not this should work?
Thanks
Click to expand...
Click to collapse
Not a chance. Not only is it physically impossible as the T-Mobile version does not have the necessary CDMA technology inside to use VZW's service for talk, text, and 3G, but also because VZW doesn't accept phones from other networks on theirs.

Flashing to another Carrier's firmware using an unlocked phone

Hey,
I don't know if this is too device specific, but I have a Samsung Galaxy S8+ (SM-G955U). It was originally AT&T, though I got it unlocked the day I purchased it. I use it with T-Mobile now, and I never was able to update my phone since I switched. Turns out, it was because you can only do so using AT&T activated SIM cards. Literally had to get a prepaid to update it.
My questions is: Since I have an unlocked phone and use it with T-Mobile, is it possible for me to flash T-Mobile's firmware updates to my phone without consequence instead of having to get an AT&T SIM card every time to get their firmware?
I did some research, but was not able to come up with a definitive answer. It would really save me a lot of trouble if such is possible.
If not, any other way I can update without having to get through AT&T's prepaid SIMs?
Really would appreciate any help given. This has been driving me insane.
Thanks!

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