Aaaaaaaaaaaaaaaaargh!!!!!!!!!!!!!!!!

So I got my replacement SIM card from T-Mobile today. Put it in my mobile, turned it on… and it didn’t work. Screen lit up for 2 secs, that was it. I thought “damn, how annoying”, put the temporary O2 card back in, turned it on… and it doesn’t work!!!!! So basically my new SIM card has wrecked my old phone too which means now I have NO phone, and if I can’t resurrect this I’ll have lost my whole phonebook too and will have to painstakingly add it all again manually from an old back up.