If I buy this tablet on AliExpress, will a Simm card work on T-mobile in the US? I can't find a listing for the cell phone frequencies this tablet supports or any indication of whether there will be any differences between the version of the tablet I will be able to buy on AliExpress and the one that will soon show up on Amazon.   Will Aliexpress ship a US version that includes US cell phone frequencies?

One other question. I understand it has just a single speaker, but if I connect a wifi bud to it, is the sound stereo or mono?