Bit of an odd one. I have an Elephone P6000 and on the Talk Mobile (vodafone) network. A few weeks ago I put in a Three sim card in order to activate a Deezer offer. When I put my Talk Mobile sim back in, mobile data will not turn on and bizarrely the pull down menu will not pull down. There is a good 3g signal shown. Everything else works. I got another Three sim to try and it all works again. Put the Talk Mobile sim back in and back to it not working. I've tried everything. I've manually entered the APN settings and checked they are definately correct etc. Tried it with my wife's EE sim and get the same problem - no mobile data and pull down menu won't pull down. It's almost as if it's locked to Three but everything else like SMS and calls work whatever sim card is in. Any advice? Thanks.