Hello guys

Sorry. I'm new to the topic.

I have an iPhone 3G from swisscom (firmware 2.1). the phone was activated with a swisscom sim card.

but I would like to use it with a sunrise SIM card. For that I bought a Turbo SIM card (v2.1).

So, when I insert the sunrise SIM with the Turbo SIM everything works fine at the beginning. I get a sunrise signal and in the top line the 3G symbol shows up. I can make calls, send SMS, surf the internet and receive calls.

But after a while the 3G symbol is replace by an E or nothing. And from this moment on I can't receive any calls anymore.

I haven't applied some special settings yet (I don't know which) or wasn't jailbreaking my phone.

I'm clueless about what I have to do next. I just wanted to ask you guys for a hint.

Any hint would be appreciated

thanks a lot.