Hello

When i turn my phone on i have about 5 seconds to use it as normal but after that it comes up with "security failure!" and then a screen appears with "emergency calls only" and i can only dial for emergency, can't use any other feature of the phone. Somehow it has locked and done this i have no idea why it did this!!!

note: when i turn my phone on i enter my usual pin, it accepts the pin and then goes into the phone as normal then does the above... thats why this is confusing!

if anyone has an idea would be much appreciated