Keep In Touch Reminder Pro

Keep In Touch helps you maintain relationships by reminding you to call your friends, family, or business contacts on a regular basis. You choose how often you'd like to talk to someone and we'll remind you to call or text regularly.

For example, set a reminder to call your folks every 7 days. Once you call, the reminder will be reset to go off again in another 7 days. This is a great way to remember to stay in touch regularly, and manage your social life.

Features:
-Specify how many days you'd like to pass between each conversation.
-A daily alert when you are due to contact someone.
-You can change the alert time, or disable notifications all together.
-Due dates are automatically updated when you phone or text a contact.
-See when you're due to contact someone directly from the main screen.
-Phone or text a contact directly from the main screen.

Try the Lite version before you buy:
http://play.google.com/store/apps/details?id=ca.journeytech.keepintouch.lite