First, thanks to all for fielding a noob question. I'm looking at a Huawei E1750 for my Wife's Flytouch 3. but the ads say "Unlocked, Sim Card not included" soooo... Can they be used without a Sim card? or, do I need one just to get online? If I do need a card, do I have to take it into a Cel phone provider to make it work? I looked at the installation instructions below, but I didn't see any mention of a Sim card. Any light you could shed on this subject will be much appreciated.