SO, all I have to do is swap out my T-mobile sim card and out into the unlocked Ultra Z, and it will work?
1402147
It's perfect my lte speed.can go up to 35mbps on my 6833 on tmobile here in orange county California.needs micro sim.
1402148
Yep. Make sure you have a micro Sim, though. If you have an older mini Sim, you can trim it to size but if it is too old, it won't support LTE. You can always get a new Sim from T-Mobile.
1119524
my phone was unlocked when purchased. I found that if you change the direction that you put in the sim card it should work.
949704
Yes it will cos is unlocked and it works perfectly wt t mobile serviceJust insert u SIM card
363458
sorry but i cant affirm that works, i use a t mobile sim card and that i can tell u that works good.
1749283
Put the card in your unlocked phone, call ultra mobile, give them the set of numbers in the back of the Sim card. And that's it
1339718
If it is unlocked it will work with T-Mobil. Unlock code is free from T-Mobile.
1496566
So, if I have an AT&T; account already, can I just switch SIM cards and have it work?
1948917
Yes... I have the t-mobile family plan and that is what I used. You just call t-mobile or through their website, update your line with the new SIM card number.
1638948
Yes, it is unlocked, i actually have t-mobile service and the phone works perfectly, minus the stuff i said before
2258064
I'm also a T-Mobile customer. I just moved sim card from my broken GS3 to this one, it worked fine.
926699
yes it is. just insert your SIM card and it will work. my network is t-mobile and had no problem with that.
424875
Yes, the old sim card will work. You'll still need to get your mobile carrier to activate the phone, but it should be straightforward.
1500084
Yes thats correct all you need is your t-mobile sim card and you are good to go.
1982288
While I cannot guarantee anything, t-mobile and AT&T; use the same types of connection, so you should just need the right SIM card.
14154
Well, it uses the micro sim, is unlocked and T-Mobile uses the same kind of network as AT&T; so I don't know why it would not work unless the other two replies know something I don't.
1092675
I have a t mobile card in but I'm not sure if that's the only one that is compatible
2226401
It should, I was going to do that with mine. But just remember T-Mobile usually uses Sim Cards.