I called sprint to check on my free month of the WiFi router to see when it ends. The rep I spoke to said for some reason he did not see an expiration date on my promo. He told me that when the promo was over it would just come off and I woukd not be able to use it until i called them to have it put back on. I have never heard of that, just wondering if anyone else's promo has ended. If so do they just start charging you or do you have to call like the rep said.