I have an iPhone 5s that I recently got swapped out in February for a different reason. Ever since then I've been getting slower lte speeds for att. In a large area where I used to get 30mbps download I am now getting around 5. I am not throttled. My sister also has a 5s and we swapped sims and the phone still has the odd behavior. I've tried restoring the phone and setting network settings. Is the LTE part bad in the phone? Should I set up a Genius Bar appointment? Thanks!