No hidden fees from Comcast for me.

Step one have a SO in the house to switch account to.

Step two take all Comcast equipment to the store, mine was in Middletown and cancel.

Step three have SO sign up for Internet only I pay 39.95 for 800 speed with autopay.

Step four buy your own modem and router and plug them in and activate on SO's account.

Step 5 enjoy the fact that n the North East there is no cap on data.

Have not tried Frontier but would guess the fiber is fine also look if Netspeed Fiber is in your town.