if send message number 123(or number doesn't exist).
how feedback－send failed via app? device jb , use app test not appstore.
you can use twilio api or other api same let know if phone number can receive sms or not. can check before requesting send sms
link twilio follows
http://www.twilio.com/help/faq/sms/does-twilio-check-to-see-if-phone-numbers-can-receive-sms
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