Nokia 2630 sending blank texts on ot's own.

SOURCE: Nokia 5300 Wont Send Text Messages

i had the same problem. first try turning the phone off then back on and if it doesnt work after that then go into menu>optus>SIM Backup and turn it on
worked for me

SOURCE: nokia n95 cannot send text messages

smash the ****** up because it will just drive you mad.

SOURCE: Week old phone has stopped sending texts!!

Take the sim and memory card out of the phone, then type in *#7370# and then it will say restore factory settings, say yes, then it will ask for a lock code, this is 12345 - the phone will reset and then you will be able to send messages again.

!!*Make sure you back up all of your contacts and pictures etc onto your memory or sim card otherwise it will get erased*!!

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: my nokia 1600 will not send text messages, the

try to set the default factory settings