It rang once and then hung up

Same thing, rang once and hung up

Same thing here, they hung up as soon as I answered.
I called back and got a recording that said it was the "American Prescription Card Service". Trying to promote no cost prescription cards.
I figure they got my information from a time that I used a discount prescription card while I was between insurance companies.
Seems to be harmless but still annoying.

....RANG 3 TIMES & HUNG UP......TRACE REVEALS MS. GRIFFITH OF HOUSTON TEXAS...DON'T KNOW THIS PERSON...SUSPICIOUS .

Second time this month calling my cell and immediately hanging up when I answer..