Reputable exchanges require ID but there's a number of ID-less swap sites. They're very sketchy and charge like 20% fees, because it's a common way to drain stolen credit cards. I don't do crypto on mobile but the worst apes do and I think Trustwallet might offer such a service through MoonPay: https://trustwallet.com/buy-bitcoin/.
Reputable exchanges require ID but there's a number of ID-less swap sites. They're very sketchy and charge like 20% fees, because it's a common way to drain stolen credit cards. I don't do crypto on mobile but the worst apes do and I think Trustwallet might offer such a service through MoonPay: https://trustwallet.com/buy-bitcoin/.