Last week I updated to ios 4.3 on telecom. I also got a version 3 simcard.

Now my iphone will not get reception after a reboot or exiting aeroplane mode. My work around is to pull the sim card out and slot it back in. This then gives me full bars.
I get the telecom word but no bar's. And in the CBD I get get data with no bar's but cant do anything else.

I've checked my carrier settings and they are fine. Although I cannot receive mms but can send ok.

a 2degrees simcard works in my phone no worries although my simcard does work in other iphones and non iphones.

I'm pretty stumped at this stage. I do have my shsh keys saved so I could roll back to 4.2.1.