Can you have a payg phone with just BB services on there each month. My kid has an s3 but misses BB messanger not paying for another contact or top ups each month but don't mind £5 month just for BB if you can do that.

Anyone know done that?

TMobile do it for £5.00 for 30 days, or £20.00 for 6 months. It includes internet data up to 250mb per month as well.

thought I had seen that before but couldn't see it on there now will have another look ta

They don't promote it much.
Here's how to do it:

1 Get a T-Mobiile SIM
2 Put £5.00 or £20.00 of credit on it
3 Text 'monthbb' or '6monthbb' to 441: exactly as in the quotes, no spaces.

BBM usually activates within an hour, sometimes longer,depending on BB's server responses.