At my rural home, why when I have full bars showing do I get great service sometimes and no service others? Full bars show whether I can connect or not connect. When I check available networks I get two Cellular One networks. when I check details I get 831-503? for both Cellular One networks. I am able to connct fine away from home wiht less bars showing. Location 41.90518, -76.16118 enter in maps.google.com I may be able to connect fine, then not connect at all. When I can not connect, the call dials, then beeps three times and goes back to menu. Cellular One sales says I need new SIMS. The old ones are only fivce days old. I just bought these phones. Will new SIMS help?