Join Date: Dec 2008
Location: Mostly living in the basement
Programs: Free Agent Level 2; MR LT(!)TE, HH SE, ALL SE, BAC Silver, DL MM, UA PS, 2V Fanboi, CBP GE
Posts: 5,347
AFAICT mobile checkin hasn't altered my upgrades (or lack thereof, similar to comments above). I have switched over to using it most of the time though as (1) the hotels seem to appreciate the ETA, especially with a late arrival and (2) it does seem to speed up check in a bit.