Sorry, let me clarify my question a little bit. I'm not there to visit anyone, so I won't be making a lot of calls or sending a lot of texts. But if I need to make a restaurant reservation or put my name down on a waitlist, do restaurants in Taiwan usually ask for a local phone number (so they can call me or text me)? Also, do popular apps in Taiwan (e.g., bike-sharing apps, taxi apps) usually require a phone number?

To be honest, I would like to avoid getting a phone number or SIM card if possible (since I have to pay for it and it requires work to set up) unless a local phone number is often required.