Been on a Voda contract for ages now, but found a really good deal online for the X10 Mini Pro on TMobile with 1000mb web, and enough mins/texts for what I use.
So call up Voda to get my PAC, guy asks the obligatory "how come" question, I say that I found a good deal and give him the specs when asked.
His reply is simply "wow that is a good deal. Well your PAC will be texted to you in 2-3 days" ... No attempt what so ever to tempt me to stay, no "let me see what's the best we can offer you", no nothing.

So call up Voda to get my PAC, guy asks the obligatory "how come" question, I say that I found a good deal and give him the specs when asked.
His reply is simply "wow that is a good deal. Well your PAC will be texted to you in 2-3 days" ... No attempt what so ever to tempt me to stay, no "let me see what's the best we can offer you", no nothing.

A value customer is one which can't control their usage and goes over their minutes!
You will get good upgrade offers.
You're also more likely to jump providers as well.