I have an S8 and I used to get around 10 mb (speed) and now i get around 0.5 mb. I haven't used up all of my data and have 4/5 bars and LTE. Shouldn't "carrier aggregation" and "antanna beamfoming" help?
The 'Carrier Aggregation' technologies, should definitely help you get the fastest speed when available. We'd like to check on your current coverage status. Would you please send us a private message with your address? Let's see if there has been any changes on your coverage.