I use the SGH-I547C, a ruggedized Android Galaxy smartphone with OS 4.1.2 The screen goes dark every 10 sec or so when not active, so I can save on battery. (This phone seems to chug thru battery, needing to be charged every night.) What is annoying is that every time I wake it up from dark screen it has lost the service, and I can't call or text for sometimes even a whole minute, which is how long it takes to find the Koodoo service. Does anyone else have this problem? Trying to figure out if it's a faulty phone or a problem with Koodoo. I'm right in the city of Calgary, and never on the outskirts, so I should have service all the time. Any thoughts?