this post was submitted on 26 Dec 2024
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Privacy
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This is standard practice for me. You don't even need another flip phone. Most phones come with a dual sim tray. I keep the 2nd sim in my phone and keep the sim switched off in the settings. I do all signups with this number.
This is the answer I was looking for! Thank you!
The IMEI number on the phone is essentially locked to the device, swapping sims won't change it. So a phone activated under your real name on one network could technically get traced back to you even when using a different SIM card.
Also, carrying a phone with both SIMs active is completely unprotected from correlation attacks by anyone with access to the cell tower data. It'd be blatantly obvious that the location of one SIM is the same as the other all the time.
All depends on the threat level you expect, but if you're worried about a VOIP account being compromised to get your real number, you are talking about pretty sophisticated actors.
Just be careful about the sim expiring. Each network will have its own rules. The sim I have stipulates that it needs to be topped up at least once every 6 months and a call or SMS sent every 3 months to keep it active.