My son is no longer a teenager, but it's still tricky to call him on his cellphone and expect him to answer every time.  This is an app that I could have used years ago.  It's called Ignore No More and it was developed by Texas mom, Sharon Standifird.

When you call your child and they don't answer, this app locks their phone so they HAVE to call you back before they can use it again.  The only other number they can call is 911.  They can't text, use apps or play games until they call you back and get the code.

(Getty Images)

The Ignore No More app costs $1.99, but for now is only available on Android phones...a small price to pay to make sure your child calls you back, yes?