### Answer For inbound phone calls, you can use the

{{user_number}}

dynamic variable to access the caller's phone number during the call [(1) ]() . According to the documentation,

{{user_number}}

represents the user's phone number, which for inbound calls is the

from_number

. This is one of the default system variables that Retell automatically provides without any configuration required . You can use

{{user_number}}

in: - Prompts and agent instructions - Begin message (opening greeting) - Tool configurations - Node prompts in conversation flows For example, you could add something like this to your node prompt: "I see you're calling from {{user_number}}. Can you confirm this is the best number to reach you at?" The variable should resolve in real time during the call. If it's coming through empty, double-check that: 1. You're using the exact syntax with double curly braces:

{{user_number}}

2. The spaces around the variable name are minimal (they get trimmed when evaluating) This variable is specifically available for phone calls only .

​ To learn more, see the sources I considered: [[1] Dynamic Variables](https://docs.retellai.com/build/dynamic-variables) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.