if ur talking about preinstalled music files, try using the Nokia S/W updater to reinstall ur phone's software. remember to back up ur data before using the updater to prevent data loss
if ur not able to send SMS to one specific number, check with ur network provider but if not able to send to all numbers, check ur message centre number under
Messaging > Options > Settings > Text messages > Message Centres
the message centre number will have to be gotten from ur network provider
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