I have an old 7200 handset and i want to give it to a colleague to use for a couple of days while out of the office, its not worth signing up for a full contract so I was wondering if this was possible?

The handset was previously used on O2.

It will only work for voice and SMS. You can't get BlackBerry data with a PAYG sim card.

assuming that the device is subsidy unlocked, depending on the Prepaid Service Provider, you may be able to use a wap browser and connect via GPRS . . . as previously stated, voice and SMS is basic service . . .