Guys,

I got a new hotlink sim card, when I put it in my iphone4, it becomes cacat:

- when other ppl call me, got ring tone on their end, but my phone doesn't ring
- i can't make calls (it just hangs at "calling XXXXX") or send sms (always message fail)
- i can't input any service commands.

the sim card, i put into my fiancee's iphone4, no problem.
other sim card, i put into my iphone4, also no problem.

so ... any ideas what could be wrong and how to fix?