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It's possible to add strings at the end the phone number that could be used to exploit common injections (XSS, SQLi, SSRF...) or even to bypass protections:
OTP Bypass / Bruteforce would work like this:
References
Learn AWS hacking from zero to hero with htARTE (HackTricks AWS Red Team Expert) ! Other ways to support HackTricks:
If you want to see your company advertised in HackTricks or download HackTricks in PDF Check the SUBSCRIPTION PLANS !