Can you send txt msgs before? Please try calling if it iw working. If you can't call too, please call your service provider.
SOURCE: Nokia 2310 suddenly stopped sending text message
If the SIM works fine in other phones, there is a phone issue. See if you're eligible for a warranty replacement (eligible if purchased new from AT&T within the last year or if purchased refurbished from AT&T within the last 90 days). If ineligible and you have insurance, use it... there will be a $50 deductible applied to your next bill. If ineligible and you haven't got insurance, get a replacement through somewhere like ebay or craigslist, upgrade (never EVER use wirefly or amazon, trust me) through AT&T preferably, or purchase a gophone (AT&T prepaid) from walmart, walgreens, wherever (If you go to RadioShack, they'll do everything for you). You just put your SIM in it and it will have your phone number and contract information... you don't have to sign up for prepaid service.
SOURCE: Frusteration with "Invalid multimedia settings" on a Nokia
Hey i had the same problem and found out how to fix it. If it sais "Invalid Multimedia settings. Check settings" then you have to follow these steps:
1. Go to message settings under messages at the main menu
2. Click Text messages
3. Go to Message center in use and select SMS settings
This is how i fixed my problem which was the same as alyluvsskitt's
If this works for you then have fun texting!!!!
SOURCE: Unable to text
problem is still there after confirmation of message centre number.
I think the only solution for this problem is to reinstall the software coz this particular problem in N73 is a common one. So am also about to reinstall the software.
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