I am looking to get either an XDA Mini S or MDA Vario, obviously on either O2 or T-Mobile. Just after some advice about which network would be the better option. Regarding the phone itself on each network - software-wise - like are there locks, restrictions etc, but also the networks in general: I'd be looking at the £35 p/m 12month contracts in both cases. At first glance, T-Mobile looks the better one as you get 100 more mins and 100 more texts than O2 and the roaming charges are cheaper (going to Canada in a few weeks). However, voicemail costs and there is no rollover or data allowance. Any advice?