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Hi,
Messagin App(By Default app) showing an error while sending a message after salecting contact from my contact book.
Eroor is " Message has no valid recipient".
Please help me for the same.
Solved! Go to Solution.

When i am removing comma, contact is also removing.

Are you syncing those contacts from your gmail? facebook? or anywhere else?
If I were you, I would transfer all my contacts to Gmail then edit them and transfer back
Alternatives on How to backup Xperias
It will be very helpfull if you let me know the steps for transfor the contacts to gmail then edit etc...
Hi, the 'comma' always appears after you select the contact you wish to message, this is if you wish to add another contact....so this is not the problem i'm afraid 
I had a lot of problems with texting on the Xperia. I ended up just loading GO SMS and use it. It works great