6630 is a GSM/UMTS phone... (3G compatable).
You dont need a 3G phone though for this type of TV service as it is 'broadcast' on frequencies allocated to DAB Digital Radio. It should be reasonably priced as it is transmittting all the time and not specifically 'on demand' (like 3 or Orange's TV service). 02 are experimenting with another 'broadcast' type of TV service called DVB-H presently that is similar.