We have a shared data plan with Verizon that covers my husband's iphone and our mifi/wifi (he has a phone, ipad, and we share the laptop).  We turn the mifi/wifi device off when not in use (i.e. when we are asleep or not home). When using the ipad or the laptop at home, those connect through the mifi/wifi device.  As of today, since Feb 23rd, the phone has used 2.911 GB of data, and the mifi/wifi has used 2.931 GB for a total of 5.842 and we are not even halfway into the plan month. We are on a 15 GB plan now and are still going over that although we don't stream movies, TV or anything on either device. That seems awfully excessive. From what you are all saying, this is normal?  Our friends on ATT with more devices/people on their shared plans are not going through near this amount, but the downside for them is coverage isn't as good around here.