directly to remove a network-level "Shortcode Blacklist" or "Message Blocking" setting
The most effective way to resolve this is by speaking with a representative who can toggle the shortcode feature on your account.
“Unblocking via my T-Mo account online worked instantly. I was missing 2FA codes from my bank – fixed in 2 minutes.” – Verified user review.
: Some older or specific no-contract plans may have shortcodes blocked by default. If you are on one of these plans, you must explicitly ask a service tech to clear the block to receive PINs or verification codes. Device-Level Troubleshooting