Only true for bad informasjon gathering operations. They have device id and ip address, so they know it is an old phone. They will know that your new phone is your new phone and will prioritise that one. Now they just also know that you are trying to cheat the system, so you are now put in the “watch with more care”, so you will be the most advanced agents on you.
We are talking about privacy, not security, like when being individually targeted by the state or someone else, that’s another topic. Privacy-wise the main source of information about you comes from apps that collect all the information available (which is huge), they sell it to data brokers which in turn sell it other companies that tipically try to sell you something or want to know your habits (like your employers). If you don’t use their apps they can’t collect information about you and sell it, and that happens when you migrate to free software. Only location will still be collected because mobile service providers log it and sell it, but there are ways to mitigate that too.
