This app is just for fun or to mess with your friends:)
SMS Multiple Send | Trgovina z aplikacijami+igrami za Windows Phone (Slovenija)
and its free.

This other app is more serious, with this app you can save sms and send it later, on the date that you set your reminder.
SMS Delay | Trgovina z aplikacijami+igrami za Windows Phone (Slovenija)
also free.

Thank you guys and girls. Hope you'll like this apps.
Hope to get some feedback on them:)
bye