I tried to search for battery issues and got results for the whole android forum. Is there a search feature that filters searches from within the Huawei forum? If there is I can't seem to find it. So if this was covered already I apologize in advance. My question is-does leaving a sim card in the tablet use battery power even if the phone is not used? I have been leaving out my sim card (t-mobile extra) thinking that it saves battery power. (I don't use it as my main cell phone.) It makes sense to me, but maybe in practical terms it doesn't draw power. Or is it negligible? Thanks for any replies on this curious question.