Is this still an issue for you today? Have you tried the service in any different postcode areas or is this an issue in one location? Does performing a manual network selection help you pick up a signal at all?
have a blackberry z10, last night about 7pm i lost my service and was getting a sim not provisioned MM#2 message, along with a searching for network and emergency calls only.
spoke to ee who said that it was due to a problem with them trying to send me an update and they were going to clear the updates ...... they said to either order a new sim, from them would take 5 working days to come through and cost me £10 but they wolud credit my account with £10 straight away or i could go into an EE shop buy a new sim for £10 and they would credit my account with £10. have been to a shop today and got a new card ...... now getting a sim not provisioned pleas speak to your carrier .... spoke to ee and they said that the new card has been registered but it might take a while for it to find the network!
sounds to me like no one at EE has a clue what these messages are about everyone i spoke to seems to just say wait for 24 hours and see what happens.