I'm with yoyo
Every year, I ask for the pac code. After the usual "why do you want the pac code" question followed with the usual "what other reason is their for asking for the pac code" reply, I get put through to the (usually) nice lady who's job it is to do virtually anything she can not to give you the code.
Just mention that you are going to join "3" due to the fact that they offer a load of free minutes. This really offends her (must be where most of their leaving customers go). I always say that their is nothing wrong with T-Mobile, but feel they just cannot compete with "3". Shame that you'll also have to swap your handset as you really like the one that you are using..
Used this for years. The first time I got flext25 for £10 including v.a.t, second time got flext35 for the same price..Remember the bit about the handset (you don't need another handset). Basically bandwidth in relation to the subsidised handset costs nothing. You will always get lots more talktime / txts, etc if you don't want an "upgrade".