21-09-2013, 09:43
Many phones save the network ID of the home network operator as a part of APN settings. Only APNs that correspond to the currently used network ID/IMSI are displayed and can be used.
As change of country means a change of IMSI, in the case of having a local number, you have to enter the APN settings again as the phone will not use those from the other IMSI. However once APN is set for a particular country/IMSI, you should not have to enter it again for that country/IMSI.
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