Two-way SMS communication is facilitated through the association of a Messaging Service ID. You can either select an existing Messaging Service ID from the list or create a new one.
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For the US and Canada regions, please opt for a registered 10 DLC Messaging Service ID, or create a new one and apply for 10 DLC.
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In other regions, you have the option to select an already established Messaging Service ID from the list, or alternatively, you can create a new Messaging Service ID if needed.

Registering for 10DLC is essential for US phone numbers. This process ensures compliance and better communication delivery. Stay connected effectively by completing your 10DLC registration today.
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How can I register for A2P 10DLC messaging on the Twilio platform?
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https://support.twilio.com/hc/en-us/articles/1260801864489-How-do-I-register-to-use-A2P-10DLC-messaging-
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How can I register for A2P 10DLC messaging on the RingCentral platform?
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https://support.ringcentral.com/sms-registration.html
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How can I register for A2P 10DLC messaging on the Plivo platform?
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https://www.plivo.com/sms/10dlc/#10dlc-offers-several-benefits