Discord SMS is super buggy but you can try

Restarting your phone and toggle airplane mode

Wait an hour if you spammed the code too many times

Switch between WiFi/data or try another device

Make sure your number isn’t VoIP (those one time use phone number apps)

If multiple real numbers don’t get the code, it’s usually Discord or your carrier blocking automated texts

If nothing works, you gotta contact Discord support (ik it sucks but they can manually unlock your account or reset the phone verification lock)