This application immediately allows to send to your friend the "call back" from your phone book - a message asking you to call back. All you have to do - is to know your mobile operator's code (will be autosaved). If your mobile operator has another format, or you wish use one more service, you can use second field.
https://play.google.com/store/apps/details?id=about.me.s.ivan.mayachokprostoclick
https://play.google.com/store/apps/details?id=about.me.s.ivan.mayachokprostoclick
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