India is just ridiculous in this regard. Recently, there's some app at security gates at the entrance of apartments that asks for phone numbers. It's strange that one needs a phone number to visit my friend.

Context for others, the app is likely https://mygate.com/

Do you put your real number in for those kinds of purchase? I generally just put in a random 800- number.

I just say "No, thanks" with a smile.

I went to the apple store to buy a router. It took me involving the manager before the guy let me pay without leaving my name and address.

Doesn't India link phone numbers to bank accounts?

As I've understood it, it's more like you can charge (some things) to your phone bill. Like buying ringtones/apps for 00's phones, but not just phone-related purchases.

lonelappde is right. All bank accounts in India must(?) have a registered phone number associated with them. This was primarily done to ensure SMS transactional alerts, but has escalated to all sorts of usecases now (including the enforced regulated way of doing 2FA).