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Originally Posted by Effendi
Yes, exactly that is what I was thinking... not all operators support callback
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But, as you said before, callback capability is not needed necessary for incoming calls. I think that if it is the case and incoming calls work, UM simply skips Indonesia in their coverage listing because the service is not fully functional there. Note that Hop OTOH "reveals" its roaming partners with incoming calls only - it's just a difference in policies....