For instance, Verizon was sued for disabling the ability of phones on their network to transfer photos using Bluetooth, because they wanted to charge you money for a simple file transfer.
https://www.eweek.com/mobile/verizon-wireless-users-sue-over...
I ended up using that phone to take a picture of the background I wanted. Verizon didn't charge for setting wallpapers using pictures taken with the phone!
I switched to a Windows Mobile 6.1 phone (Samsung Blackjack) and it was so liberating. Sync music via USB! Set custom ringtones using your own MP3s and not whatever the Ringtone store was selling for $2.99.