How can I cancel my 4G router?

[XRaySpeX]

You need to contact EE giving 30 days notice of cancellation of your mobile contract. If you are still within your min term you will be liable to pay early termination fees for the rest of the term. It will basically be months left x monthly charge - 20%.

[ewanrw]

You need to change your auto fill. It’s 4%.

Term fees have VAT included and have done since Jan 2021 when HMRC changed the rules.

[XRaySpeX]

@ewanrw : I stand corrected! ETF's are now (since 1 April 2022) subject to VAT.