I bought mine off of ebay (it was in mint condition; nothing wrong at all), and where I had service with my berry (aka blackberry) I do not have any service with my EVO 3D. I'm wondering if this is just our phones or if it's an Evo 3D issue with trouble finding signals or something.
Obviously because you always have service if it goes 0% of the time without having a signal lol (meaning it always has a signal, therefore uses more battery).