As a result of trying to send MMS I ended up with a download which just wouldn't stop; I turned off mobile data but it still wouldn't stop. In desperation I powered off. Now I"m being asked for my SIM code. My two attempts with the only passwords normally used on this phone have been unsuccessful. Now left with just one try. HELP!  

I'll just settle down with Beechgrove Garden and Gardeners' World and cross my fingers someone can help.