I recently found the foxfi app today and it works great. However, I'm a little skeptical because when I access it, my stock app comes up with a message that say's "stock tethering or mobile hotspot active click here to configure". I found another post that said to ignore it but I wanted to see if anyone has used this app for over a month's time and did not see a difference in charges on there bill. It seems too good to be true, but no worth drawing Verizon's attention or paying extra for. Thank you for your help!