Unblocking a Fonic Sim

[inquisitor]

Afaik Fonic do not lock SIM cards anymore. Why don't you try it? Just put your SIM card into a phone, switch it on and check if it will register on a network (Fonic SIMs are enabled for roaming and should work in the US, too). Once it is registered you can additionally try to place an outgoing call (just call your US number but do not pick up the call) - if it rings your SIM is still completely active.