### Answer \Yes, you can access the caller's phone number and use it in your prompt during the call. [(1) ]() [(2) ]() When a call is initiated, the call object includes a

from_number

field that contains the caller's phone number in E.164 format. To inject this into your prompt dynamically, use

retell_llm_dynamic_variables

when registering or creating the call. [(1) ]() [(3) ]() For example:

json
{
  "retell_llm_dynamic_variables": {
    "customer_name": "John Doe"
  }
}

You can add the caller's phone number as a dynamic variable and reference it in your agent's prompt using the variable syntax (e.g.,

{{caller_phone}}

) . For inbound calls specifically, you can use the

inbound_dynamic_variables_webhook_url

to populate dynamic variables that get passed to the Retell LLM, allowing you to access the phone number inside the prompt. [(11) ]()

​ To learn more, see the sources I considered: [[1] Register Phone Call](https://docs.retellai.com/api-references/register-phone-call) [[2] Get Call](https://docs.retellai.com/api-references/get-call) [[3] Create Phone Call](https://docs.retellai.com/api-references/create-phone-call) ​

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