04-11-2013 04:37 AM
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This may happen if the other end ignore or delete you from his / her contact list , Is this happening with any of your other contacts also.
04-11-2013 04:44 AM
04-11-2013 04:56 AM
If this happening with only one specific contact then the problem may be with other end as I said , If it happen with multiple contacts then it might be a Server issue and in that situation you should contact your Carrier MTN and let them know the problem you're having.