6233 no reception signal at all

this happend one day after i sent message.
then i found the signal bar is empty.
no signal.i off the phone for 2days.
on again it works fine,then after one sms sent out,it happend again.
is that firmware or the anttena or mainboard damage?

It's either a software fault or hardware failure.
Backup everthing you want to keep then download and install the nokia software updater:
http://www.nokia.co.uk/A4226014
If this doesn't fix it then you will need to visit a nokia care point.
Care points:
UK
http://www.nokia.co.uk/A4228006
Europe:
http://europe.nokia.com/A4388379
Elsewhere:
http://www.nokia.com and select your country.

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