Mad as a Haddock
I know a couple of you are running M3100s and might be interested in how to adjust the ringer time before the answer phone kicks in. Well all you have to do is ring **61*07973100123*11*30# then press the dial/send button. This is for 30second ring, so I imagine that the 30 bit is the time required. This also worked on my buddy's M600.