# 21266: 'To' and 'From' numbers cannot be the same

Log Type: APPLICATION

Log Level: ERROR

## Description

You attempted to send an SMS, but the `To` phone number you supplied is the same as the `From` number.

### Possible causes

You attempted to send an SMS from a Twilio number to itself (i.e. putting the same Twilio number in the `To` and `From` parameters).

### Possible solutions

Ensure you are not attempting to send a message from a Twilio number to itself.