I have just, this week, received my Mifi. I guess my order went in just before registration suspension. I got online okay, but I do have a Tmobile SIM, not Sprint and I got stopped at 25 gbs. ( It let me get to 25, then told me I had hit my 10gb limit.)
Until that happened I was really happy, no glitches, but that only took me 3.5 days to hit. Doing the trouble shooting I found that the APN address is incorrect. So, I am thinking this is all related to the same overall issue. My concern is how long till it's fixed. I will be on the road and working in a few weeks (first timer) and this sounded like the answer to my internet concerns. I need options for if this does not get resolved.