I just bought my first 4S. It's an Apple unlocked version, but I can't get the SIM card I bought here in Brazil (through Claro) to work. Every time I insert the SIM the phone searches for about 3 minutes and then says, "no signal":
Using my co-workers' SIM cards (both Brazilian through Claro/Vivo/Tim and international through Vodafone, Orange, and Rogers) work fine in my phone.
My SIM card works fine in my co-workers' phones.
I'm not getting any "bad SIM', "SIM card failure", "invalid SIM", or "no SIM" error messages. Matter of fact is I'm not getting any error messages at all.
Has anyone else experienced this?