UPDATE 25/11/00
I can't remember the last time I topped up this mobile - it must have been months ago !
This proves two things...
1. I don't make many calls and
2. You don't need to top it up every two months as originally stated in the instructions when I got it.

ORIGINAL OPINION 07/09/00
I got my Philips C12 when I signed up with BT Cellnets Pay and Go.
For the price this phone is tops. Its fairly small, although I immediately doubled its size by sticking it in one of those cases with a clip on the back. I think this was a good idea though since I have dropped it loads of times and the case seems to cushion the fall adequately.
This phone has loads of features text messaging, voice mail it has 20 different ring tones and 3 different volume settings. I use a ring that sounds a bit like "blankerty blank" - good choice eh?
This phone has a calculator, biorhythm calendar, stopwatch and an alarm. It can store loadsa numbers in its memory, and it has direct access to 1471 and the talking pages can be accessed for nothing.
You can check you balance straight away - you just press a key, type in your voucher number and call time is instantly credited.
The best thought is the charger; it only takes a little while to fully recharge although I did mange to break off the little clip on it which means it doesnt stay plugged into the phone very well, I have to prop it up against something all the time. But overall for the price this is a really smart(indestructable)phone.