LG U Urbane 2, Sim cards and Cellular Service

I recently purchased an lg urbane 2 and it's great, except for the fact that I can't get it to work on any cellular... It's gsm unlocked and when I put in the sim it auto loads the APN settings and what not but still no service... I've tried att prepaid sim, h2o sim, Nada.

Anyone else have these issues or know what plans or cellular companies will work with this watch?

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