[Q] 4g on original unlocked vibrant? - Vibrant Q&A, Help & Troubleshooting

This might be a dumb question but I haven't been able to find an answer. Is it possible to use a 4g sim card (AT&T or T-Mobile) on an unlocked Samsung vibrant? My vibrant is currently rooted running CNA 3.6.5 with KA7 modem. Anyone?
Edit: Never mind, I'm pretty sure I found a post that says its not possible.

Just to clear something up, the sim card has nothing to do with the data speed.
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4g lte phone switching

question guys I have my thunderbklt but.in a few days I will also be getting a revolution so I was wondering how I would go about switching between the two I am pretty sure it.is.not as easy at&t or tmobile where u just pop out the sim.and into the new phone
Sent from my A05PTH3ORYB0LT using XDA Premium App
Meaning you want to unlock your sim card right?
I don't know why you would buy to phones >.<
but maybe you should just try
taking out the sim card and putting in the revolution. I mean its the same carrier. I don't see why It wont work. Unless the sim cards is registered to your phone then maybe it won't work. But who knows
Okay thanks
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SIM network Unlock for Motorola Backflip

I don't know if I am putting this in the right place but I have a motorola backflip (temp phone, using a samsung infuse now) and I am wondering how can I unlock it so it can be used with another network? Like T-Mobile because I really want to give it to a friend of mine who is in need of a cell phone but she is on T-Mobile. My Backflip is rooted, and running cyanogen mod 7.1... so with all that done im wondering what can I flash to the device to allow it to work with a T-Mobile sim card?
Sent from my SAMSUNG-SGH-I997 using XDA App

Straight talk sim card

So I got a att sim card for straight talk. I was wondering if I unlocked my phone and flashed the blaze radio and put in the tmo apns would I run on the tmo towers? I know you can get the tmo one but are they that much different?
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Nolenm04 said:
So I got a att sim card for straight talk. I was wondering if I unlocked my phone and flashed the blaze radio and put in the tmo apns would I run on the tmo towers? I know you can get the tmo one but are they that much different?
Sent from my SAMSUNG-SGH-I717 using xda premium
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I am on T-Mobile and generally run blaze modem, but I also tested straight talk at&t sim for a while. Here are my few obvervations -
1. I think that only at&t towers were being used by straight talk, even with blaze modem. The signal strength was different for each sim. I found at&t coverage in my area better. You need straight talk apn though, having blaze modem would make no difference. So you would need to switch apns if you swap sims (assuming you have two sims).
2. On straight talk the signal was the same regardless of the flashed modem - at&t modem or T-Mobile blaze. And again att.mvno apn was absolutely necessary.
3. However, despite the same signal strength, the blaze modem drained the battery a lot faster as compared to stock at&t ics modem. Even on wifi.
If you have T-Mobile sim card you may find top download speeds with blaze modem a lot faster. However, straight talk connection is more stable. Stability is everything. I hope you have good at&t coverage in your area as I would stick with at&t ics modem. In fact that is the best option, unless you also have a T-Mobile sim and plan to swap it sometimes. But even if you have both, please note the battery drain caused by blaze modem - may not be worth it.
So the blaze isn't stable?
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What tools do u use to unlock the att so I can use tmobile straight Talk simcard?
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tech7 said:
What tools do u use to unlock the att so I can use tmobile straight Talk simcard?
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You have to pay to unlock...i was reading somewhere in here aug 11th att will unlock but im pretty sure you have to be with them
Sent from my V55 using xda app-developers app
I thought straight talk is ATT so you dont have to unlock the ATT galaxy note?
Eric-1987 said:
I thought straight talk is ATT so you dont have to unlock the ATT galaxy note?
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You can order the att or tmobile one...if you order the tmobile one you yave to unlock because it runs off of tmobiles towers
Sent from my V55 using xda app-developers app
Eric-1987 said:
I thought straight talk is ATT so you dont have to unlock the ATT galaxy note?
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Yeah why not just use AT&T Straight Talk? Same price right?
Yep same price
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Nolenm04 said:
So the blaze isn't stable?
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Not as stable as Straight Talk. None of tmobiles modems are really perfect. Better than edge for anyone stuck on T-Mobile but not stable.

Getting the i777 to work on t-mo

I am a bit confussed. Trying to get a straight talk s2 to work on t-mo for my brother. Rooted and running the collective rom on the phone. popping his t-mo card in the phone does not bring up a sim locked message, and I get no carrier signal. What do I need to do to get voice signal. does data work on this with a t-mo card? Do I tell him to move on?
Thanks
Have u checked out the straight talk s2 thread here....http://forum.xda-developers.com/showpost.php?p=33902328&postcount=1
Sent from my SAMSUNG-SGH-I747 using xda premium
Nice. I have NO idea how I missed that. I have been scrounging for a different modem for this thing FOREVER! This is why I love XDA. I pushed the crap outta your thanks button.
KGtMM
4-2ndtwin said:
Have u checked out the straight talk s2 thread here....http://forum.xda-developers.com/showpost.php?p=33902328&postcount=1
Sent from my SAMSUNG-SGH-I747 using xda premium
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AT&T Sim Cards are back w/Straight Talk!

Is there a way I can get my Verizon S4 to work with a Straight Talk AT&T SIM card?! Please say yes, so I can get rid of this expensive A$$ bill?!
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killdawabbit said:
Is there a way I can get my Verizon S4 to work with a Straight Talk AT&T SIM card?! Please say yes, so I can get rid of this expensive A$$ bill?!
Sent from my iPad using Tapatalk HD
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Yes I'm using my at&t straight talk sim on the verizon s4 and it works great!
Is there anything special I have to do with my phone? When I order the sim card from straight talk it won't let me select the cdma option so, should I just select gsm as if I have a AT&T Galaxy S4?
Sent from my SCH-I545 using xda app-developers app
killdawabbit said:
Is there anything special I have to do with my phone? When I order the sim card from straight talk it won't let me select the cdma option so, should I just select gsm as if I have a AT&T Galaxy S4?
Sent from my SCH-I545 using xda app-developers app
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CDMA does not use SIM cards. The S4 is a CDMA/GSM/LTE device. AT&T is a GSM network.
You might have to edit the APN settings to use Straight Talk.
killdawabbit said:
Is there anything special I have to do with my phone? When I order the sim card from straight talk it won't let me select the cdma option so, should I just select gsm as if I have a AT&T Galaxy S4?
Sent from my SCH-I545 using xda app-developers app
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The Verizon S4 is a CDMA phone AND a GSM phone. I believe they made it this way so you can go to about any other country in the world and still use your phone - or it was just cheaper to mass produce the radios with everything in it.
Anyway the only thing to change is the APN settings to
Name=Straight Talk
APN=att.mvno
Proxy=proxy.mvno.tracfone.com
Port=80
MMSC=http://mmsc.cingular.com
MMS proxy=mms2.tracfone.com
works perfect. However I did just find a small problem. I have flashed both cyanogenmod and Liquidsmooth AOSP ROMS and they do not work with at&t ST sim - when I call the phone it does not answer or register the call at all. Not sure what the problem is, seems like for some reason it is not registering with the at&t network. Trying to find a fix. However, the phone has worked fine with all TW based ROMS I've tried.
Ok thanks for the information but I have one more question... I am rooted with Clean Rom 1.5, do I have to unroot my phone? Will I still be able use wife tether or foxfi? I heard AT&T took foxfi away.
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Oops just saw that you messaged me - yes just choose GSM. You do not have to unroot your phone but like I said in the last post - I cannot get AOSP roms to receive or make calls - data works - but not phone calls - which is rather strange and I'm sure can be fixed but nothing I have tried seems to work.
GSM is fine but in reality once you get the right LTE bands turned on, would it be better in global?
Sent from my SCH-I545 using XDA Premium 4 mobile app
What kind of data do you see on AT&T? HSPA+? 3G? 2G?

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