Last time I switched phones I had to set up GA from scratch, re-scanning the seeds on every account. The initial SMS code was just to attach an authenticator to

Last time I switched phones I had to set up GA from scratch, re-scanning the seeds on every account. The initial SMS code was just to attach an authenticator to a new device. Someone compromising your phone number shouldn't be able to get access to your codes, they would need the physical device. Also note that there is no official desktop client, anything that claims to be is 3rd party and wouldn't be connected to your current codes.