Iphone 4s doesn't ring sometimes when I receive SMS?
I got my new Iphone 4s. I started using after a while I realized that sometimes Iphone does not warn me when I get SMS. I can't realize when I get new SMS and when I unlock iphone I see the new message. It doesn't happen very often.
I made some search and found a similar problem like mine. Here is the link:
https://discussions.apple.com/...0&tstart=0
Setting>Sounds>Vibrate-on
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