For folks who like to use PdaNet and/or FoxFi, but just got the new Samsung Galaxy S4, you might be running into some problems. Luckily, our amazing forum members are already discussing the subject and working out solutions. It looks like, for the most part, it works better on the SGS4 than it did on the SGS3 (although some folks didn't seem to have any problems on that phone either). It's interesting that these apps/services don't list the SGS4 as compatible, yet it can be made to work. Even though it can function properly on the device, it seems there can be some confusion regarding a few of the features.
If this is of interest to you, head over to the thread and join in on the discussion: http://www.droidforums.net/forum/samsung-galaxy-s4/240889-pdanet-foxfi-galaxy-s4.html