# Numeric sender ID

> A numeric sender ID is a phone number, dedicated or shared, used as the origin of an SMS; it is the only sender type accepted in the Americas and the only one recipients can reply to.

Numeric senders are numbers: a dedicated long number rented by you, a short code, or a shared number assigned by the gateway. They are mandatory where operators refuse names and useful anywhere a reply is expected. A shared number is free and one-way in practice; a dedicated number costs a rental and enables conversations.

The downside is recognition: recipients see a number they do not know, so the text must identify the sender immediately.

At SMSMeteor: where a destination replaces names, a numeric sender is assigned automatically at no extra cost; a two-way number can be added per destination when replies are needed.

Related terms: [Alphanumeric sender ID](https://smsmeteor.com/glossary/alphanumeric-sender-id), [Dedicated number](https://smsmeteor.com/glossary/dedicated-number), [Shared sender](https://smsmeteor.com/glossary/shared-sender), [Two-way SMS](https://smsmeteor.com/glossary/two-way-sms)

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