Has anyone tried using their 3 SIM in a O2 3510i (in the UK)? 3 have a 2G roaming agreement with O2, and I've been told that you can access voice and text services with the 3510i, but only an O2 one..

Is this technically possible? If so, how is it accomplished, would O2 maintain a list of IMEI's on 3 and allow any SIM coming thorough one of these IMEI's to operate on O2?

Any expert technical help appreciated..