or you could require that once a sale, contract, payment etc is reached, the phone remains as originally offered, no removal of features, or activation of anti

or you could require that once a sale, contract, payment etc is reached, the phone remains as originally offered, no removal of features, or activation of anti features allowed unless willfully and knowingly initiated by the owner [user,holder,purchaser] of the device. pushing unstoppable modifications, retroactively altering the device without consent, stuffing features with antifeatures, turning the device into something it wasnt at the time of sale, these actions should be banned for phones, as well as any other product.