Been having some weird MMS related problems in the last couple of days. To try to resolve them i've been trying to edit the APN settings, however, i've got 4(!) APN setttings on my phone which are locked, can't be edited or deleted. I'm sure i could edit them at some point in the past, but now all of them have little padlock icons next to them. Phone was purchased unlocked but pre-configured for vodafone uk. Am i missing something obvious or has my brain gone wrong?