How easy is it to switch operators?

Ofcom may be changing the rules on number porting to make it easier to switch mobile operators, but experience suggests that many businesses find it difficult to make that change for a variety of reasons.

So let's have them! We want to hear your horror stories about changing mobile operators - whether you've been on the receiving end or involved in things from the operator standpoint. How long did the process take? Has anyone experienced "dirty" ploys to stop customers leaving? Are these things that can be fixed by Ofcom's new rules, or is there more to be done?

Answers below, please...