I've recently been in Taiwan for a couple of days and obviously I had to check out the local networks here. The first thing I noticed is that Taiwan Mobile (TWM) doesn't let my German SIM card roam on their 3G network. I get a nice and clean mm reject cause 15 (no suitable cells in this location area) together with a gmm reject cause 9 (MS identity can't be derived from the network) so the mobile gives up on 3G and re-selects to GSM. How interesting, haven't seen that anywhere in the world yet. Either there was not 2G and 3G roaming agreement at all or I could roam in a 3G network of a network operator if it was available. O.k. no roaming business from me then for TWM, Chunghwa's 3G networks has no problem with me :-) And I guess other smartphone users will just do the same when coming to Taiwan when they experience this. Not good for TWM...

Hi Martin
How did you find out the reject cause?
Regards,
Vincent
Posted by: Vincent Tan | April 27, 2011 at 05:20 AM