Will an unlocked sidekick 3 work with an at&t sim card.?

Question

i already know that.. i wont be able to use the internet... but besides all that will it work specifically.

Answer 1

It should work.

Being unlocked means it works on all GSM networks, Such as AT&T and tmobile.

Answer 2

You will be able to call and text, but that's about it. Also, when you power down the device, you will lose all the data from your calenders, notes, emails etc. since it only temporarily stored. Plus without the sidekick data plan (T-Mobile) you will not be able to download any application or ringtones.