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Ever since I've had to insert my PUK code in my Iphone 4 to unlock the sim (yes, i typed the pin wrong 3 times..), i can't receive imessages anymore. also when i open what's app, it gives the message that i have to connect to itunes to use push notifications.
I came accross some similar stories, but all from people who have jailbroken their phones. Mine is not jailbroken, it just locked down because of the wrong sim.
How can I resolve this issue?
Load iTunes.
Backup your phone.
Make sure it is backed up !!
Run restore.
This will get rid of the error!
PS: do the backup. Don't skip it.

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