Per our data, Coop Mobile is cancellable monthly. When doing the maths, mind the gap between the promo price at sign-up and the regular base price. Coop Mobile runs on the Swisscom network, so switching within the same network costs you no coverage.
You can cancel through Coop Mobile customer service or your customer account.
Number portability is free in Switzerland and usually takes 1 to 3 working days. Important: do not cancel yourself if you want to keep your number. Register the port with the new provider, who handles the cancellation. Anyone who cancels first loses the number.
These providers run on the same network but cost less. Coverage and 5G are identical, and the order follows price alone.