[Resolved]  BSNL — SMS not going, service center error

hi,
I am using BSNL vennela plus plan,
When i message my friends 2 sms's are going. i.e. original+duplicate message.

I was requested customer care for solution. They said, messages->settings->sending options-> service center '[protected]'.
Remove this service center. clear it. Now restart. put the same number.

I did the same. But i was unable to put "+" sign. because it doesn't giving me option to put "+". so i entered "[protected]".