This is why many smaller companies like Virgin Mobile and Metro PCS rent space from the towers that are owned by companies like AT&T.
AT&T has some tough competition though. Although it may not seem like it, but Verizon controls a substantial amount of the cell phone industry market almost as much as AT&T themselves.
Also, if Sprint and T-Mobile were t successfully merge, all 3 companies (AT&T, T-Mobile, and Verizon) would carry nearly equal market share.
yeah
yes they are,
no
No.