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Most likely your network setting was reset. SMS is delivered via a specific service center phone number so if your phone contains the incorrect info, it'd not go through. I suggest taking it to the customer service center of your provider. The Mobifone CS is located on Dien Bien Phu, past Luna and before the roundabout to the Ho Chi Minh Mausoleum.

G'luck.

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answered about 2 months ago by kentvn

One time, my phone also could not send
messages. After deleting sent messages in sent box. It works again. So you should delete and try to send.
Good luck

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answered about 2 months ago by MisterT

I had the same problem a few times. I have Mobifone. I went to their office near Vin Com. They were very helpful and had it fixed in no time, each time I went. It's their problem, not a problem with your fone.

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answered about 2 months ago by tangoLA

I have had this problem several times as well. The first time it happened, I took it to a Nokia service center, and they fiddled with it for a while, popped out the SIM card and put it back in, and voila, it was working again. I think this has the effect that AnhChep mentioned above; it seems to reset the SMS settings to factory default. Now every time this happens I just slide out the SIM card and put it back again and this seems to do the trick.

Why does this happen? I'm not sure. Perhaps when the phone gets bumped around the SIM card is unseated; or perhaps there's something else going on.

Cheers

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answered about 2 months ago by lappolla