...and now I know that GSMWorld.com says that China Mobile operates on 900 and MobiFone on 900 and 1800.
Vietnam Mobile Telecom doesn't give enough information to tell me whether Hanoi is covered by 900, 1800 or both, unfortunately. China Mobile gives a coverage map, but Vietnam Mobile doesn't.
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A couple of minutes with Google, though...
Date: 2010-06-05 01:11 am (UTC)Vietnam Mobile Telecom doesn't give enough information to tell me whether Hanoi is covered by 900, 1800 or both, unfortunately. China Mobile gives a coverage map, but Vietnam Mobile doesn't.
(China Mobile entry: http://www.gsmworld.com/roaming/gsminfo/net_cnct.shtml
MobiFone entry: http://www.gsmworld.com/roaming/gsminfo/net_vnvm.shtml)