A2P messaging

Why it matters

Every verification code counts as A2P. Carriers route, price, and filter it separately from ordinary texts, and several countries require senders to register A2P traffic. When a valid number receives no code, the usual cause is A2P filtering between the aggregator and the destination.

Related terms

• OTPA one-time password is a short numeric code, valid for a few minutes, sent to prove control of a phone number or email address.
• Sender IDThe alphanumeric or numeric string shown as the origin of an SMS, such as a brand name instead of a number.

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