A:Answer After being a longtime AT&T subscriber, I finally broke away from the "carrier bloatware" by buying the unlocked 128g Samsung S10+ phone from BB. Basically, your phone is not tied to any one carrier & isn't loaded with useless, ram-sucking apps placed by a carrier. You slide in your old Sim card from your usual carrier or get a Sim card from another carrier without contract tying you down. I just slipped in my old Sim card from my Galaxy S7 Edge that was from AT&T. I have the same phone # & service from AT&T without a contract or bloatware.
I hope I've explained "unlocked" phone sufficiently for you.