[Q] Oppo R5 in America (PA) topic

I recently purchased my Oppo R5 from Hong Kong, and was told it would work here in the US (Pennsylvania) on my current Verizon network on 3G. SIM card inserted, contacts updated, but when trying to call/text; "Mobile Network Not Available" message comes up. Can anyone help me out?? It shows no service; which I don't understand why...

Much appreciated!!!