Forum Thread

How to use Ultra Mobile sim card in LUmia 640?

EpicBob 1,936 101 February 22, 2016 at 08:44 PM
I unlocked it by following the step on slickdeals, but the lumia 640 won't recognize the ultra mobile sim. Does anyone know of a solution?

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#2
Quote from EpicBob View Post :
I unlocked it by following the step on slickdeals, but the lumia 640 won't recognize the ultra mobile sim. Does anyone know of a solution?
Did you receive an unlock code from AT&T?
Did you enter the unlock code and did the phone display something indicating it was unlocked?
Does it display any messages or errors about the sim, what are they exactly?
Try an active sim from t-mobile or a t-mobile mvno if possible.

You may simply need to activate the sim card with Ultra mobile. You could try a t-mobile pre paid byop sim.
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#3
Quote from jkee View Post :
Did you receive an unlock code from AT&T?
Did you enter the unlock code and did the phone display something indicating it was unlocked?
Does it display any messages or errors about the sim, what are they exactly?
Try an active sim from t-mobile or a t-mobile mvno if possible.

You may simply need to activate the sim card with Ultra mobile. You could try a t-mobile pre paid byop sim.
Thanks for your help. It was actually for my gf's phone and it didn't work initiallly even with the unlock code but she was just able to send a text, so I think it might work now. Will report back later if calling doesn't work.
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