No, you cannot cancel your contract at any time with that 3 months.
Those 3 months only apply IF
A) you move
-AND-
B) the contractually agreed services cannot be granted on your new location (e.g. not same speed / technology possible)
If A) is not fullfilled, e.g. you're not moving, you are bound to your minimum contractual term.
And even IF you are moving, B) has to befulfilled in order to have the right to prematurely cancel the contract.
In case you move to an address where the contractually agreed services can be provided, the contract will move and there is NO right to prematurely cancel the contract.