Hi, I have a Galaxy S8 that I purchased in Sept. 2017 so not quite 4 years old. I don't want to replace because then I'll lose my my data plan to unlimited. I now have 45MB which works better for me than an unlimited plan for downloads, etc., work items. I tried the unlimited plan a few years ago and discovered it might work fine for a phone but not laptop for work downloads and went back to old plan a couple of days later. Now with Covid controlling everything plus e-schooling, the data plan is tapped out on tethering for wifi. It kills my data plan. I live in country and cannot get high speed internet as it doesn't go as far as where I live. My internet signal has been running 'poor' for the last several months and getting worse as losing signal. Does this mean I need to replace phone or can battery be replaced by phone store? Not consumer replaceable. What about a wifi booster; I've been looking at them online? Thanks!