@Yup Yup, you'll lose everything in your account if you transfer your phone number. But you won't lose your phone number though 😉. Choose wisely, how, when and where you port / move your phone number to. Just saying.
@Yup Transfer your number to another carrier? Then you lose all your services with PM (data inc.) and your account will close after the transfer so disable autopay (pre-authorized payment) while you can login or ask customer support via chatbot to remove your payment before leaving.
