What phone do you have? Samsung Galaxy S8
What plan are you on? My Choice +1 GB
Does your plan include data, or just talk & text? data, talk and text
The back cover is coming loose and it’s bulging. It appears the glue has loosened. Perhaps the battery is swelling. Can the battery be replaced?
If I remove the back cover, can the cover be returned to normal?
Hello @douglaso.ozdfe6,
Welcome to Republic’s Member Community! 
The back of the Galaxy S8 is held together by adhesive. If the battery is causing it to separate I would strongly suggest you stop using the phone and have it looked at for repair or replacement. A swollen battery could be very dangerous. 
If you want to try fixing it yourself, here is a resource for that:
Hope this helps.
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