We curently have 4 PAYG mobiles (all unlocked) on different networks (Virgin, Vodafone and Orange). I am looking for a PAYG deal whereby I can load credit onto a phone which is shared between the handsets. I have seen that http://www.familymobile.co.uk
do a good system and their rates seem ok.
I looked at O2 and they have a bolt on for £7.50 a month for unlimited calls between the handsets but that is not really dishing out credit to each of the handsets.
I looked at the vodafone website but I couldn't see it on there. T-Mobile have a booster option which is the same.