A shared sender is a numeric sender used by many accounts on a gateway, assigned automatically for one-way traffic where names are not delivered or not yet registered.
Gateways keep a pool of numbers per destination and send one-way traffic from them when a name cannot be used. It costs nothing, needs no setup and delivers reliably; the trade-off is that replies are not routed back to you and the number is not recognisably yours.
Shared senders are the default fallback during a registration wait and the permanent state in numeric-only markets when no dedicated number is rented.
At SMSMeteor: shared senders are assigned automatically where needed and never billed; renting a two-way number replaces them for a destination.
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See the term in practice.An email address opens the account, the rate card is public, payment is crypto, the test key is free.
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