In today’s world? absolutely nothing.
A lot of things nowadays require photo IDs, and thanks to the internet, they can verify that right away.
Signature and related ID theft occurred in the good old days, the lack of portable communication and on-time verification usually meant your signature was the only way to verify you.
As I have learned from personal experience, your mobile phone number is infinitely more valuable than your signature. If someone can ghost your phone, or transfer your number to their SIM card, they can break into all sorts of things, like your bank account for example.
If you haven’t locked down your mobile phone account with 2-factor authentication, account PIN and or secret passwords, I highly recommend you do.
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