I try to not give my phone number to any services, I don't see why they need it. On the other hand, I also don't see what harm they can do, if a friend would for example pass my phone number to someone in a PM on social media then the "damage" is done too. It's more a matter of principles to me. I'm on the internet so email seems a much more logical method of registration. Regardless where the service is located. Unless we talk about 2FA ; then a cell phone nr can be a handy tool to receive a login code in addition to the password.
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