If you’re trying to get Talkmobile working with the current version of Android and have tried various settings on the Web with no luck. The Talkmobile web site itself is also incorrect. Here are the real ones as of right now…
Go to “Access Point Names” under setting somewhere. You’ll see Vodafone ones already there, probably. Ignore them.
Create a new one. Call it “Talkmobile” or whatever you fancy. The only three settings you need to change are:
APN Name: talkmobile.co.uk
User name: wap
APN Type: * (if this doesn’t work try “Default”)
I haven’t given the MMS settings because I leave them blank and avoid rip-off charges!