Per our data, Salt plans all run as monthly contracts, so you are not tied in for years. More important than the notice period at Salt is the price once the promotion ends: many tariffs are sold at a low promo price while the regular base price sits considerably higher.
You can cancel in your Salt customer account (My Salt), by phone through customer service, or in writing. If you want to keep your number, do not cancel yourself: porting it at the new provider handles the cancellation automatically.
Price change at this provider: our report →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.