Verizon iphone 5 on tmobile?

OK so here's the situation i bought a Verizon iPhone 5 because i knew the gsm comes unlocked i went to t mobile set up the payment stuff and got the nano Sim, the phone worked great last night then i did a update and now nothing no service called tech support did thousands of hard resets tried switching airplane mode on and off still nothing also have done 3 restores through iTunes please help!

Go To Verzion For Tech Support

The update locked the sim port.
you will need to get verizon to unlock it, or pay someone to unlock it.