Open TempNumber and select any active number from USA (+1) or UK (+44). Bumble works best with these regions.
Open the Bumble app, tap "Sign Up with Phone", select the correct country code, and type the temporary number.
Return to TempNumber and wait for the Bumble verification SMS. It typically arrives within 15 seconds.
Enter the 4-digit code in Bumble. You can now build your full profile without ever exposing your real phone number.