I have an LG Optimus L9 phone, it has stop receiving sms/mms, however i can still send the ...how can i get my texts back working. Its my main gorm of communication.

SOURCE: RAZR V3XX - sends my texts as MMS, rather than SMS...

I had this same problem and called Motorola for support. The solution is to clear text/mms message inbox and outbox. The default setting on my phone was to never clear the inbox but I changed that to remove messages when they are 10 days old, I have not experienced the problem since.

SOURCE: text messaging

erase your inbox and outbox messages. Change the settings to remove messge after 10 days or less.

SOURCE: Unable to text

Hi,
This is a common problem. But there is a solution for this problem.
go to Messaging. Then hit Options. Scroll down to settings.
Hit text message. Options - Then "Message Centres".
Hit the Edit button and the following number should come up:

+47973100973
Save it and try sending messages. If again the same problem exist then call up your customer care who provides the services of your phone like Airtel, Reliance etc.. Ask the message center number and follow the above steps and save that service center number. Hopefully it should work. Thank you......

SOURCE: Cell phone N70 automatically send sms and mms

Remove memory card. Format the phone by this code *#7370#. Now format memory card using your PC. The problem is gone.

SOURCE: LG KF900 Prada wont send send sms or mms texts?

FOR SMS SENDING CHECK TEXT MESSAGE CENTRE NUMBER IN MESSAGE SETTING OPTION

FOR MMS CHECK YOUR GPRS SETTING WHETHER IT IS ENABLED IN MMS SENDING OPTION