A friend of mine is in China and has encountered a bizarre problem.
He had a China Mibile SIM card but on Sunday , bought a China Unicom card so as to get 3G.
Everything works fine, except that he cannot text (SMS) one particular friend who lives nearby him.
Phone calls are not a problem and he can receive texts from her, but my friend tries to text he just gets the red exclamation icon and it says "Not Delivered".
Other numbers he has tried have no problems.
Anyone know what might be causing this?
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