This number just called my house phone and I couldn't answer it as I was busy with the baby. With in seconds it called my cell phone.  My cell phone is new and I have only had it for a few weeks.  I have given the number to hardly anyone except family and friends AND would normally not give my cell phone number out anyways. On my caller ID it said Iowa Cell Phone call

It was probably an automatic dialer calling.  If you've given you're cell phone number out to the kids parents you babysit the telemarketers could have gotten it from them or one of your relatives.