# Connecting a pen display to a mobile device

## Overview

This guide focuses on how a pen display connects to a mobile device, such as a phone. It is a subset of the broader guide [Connecting a pen display](/drawtab/guides/connecting/connecting-pen-display.md), but it focuses on the issues that come up with mobile devices.

## Key requirements and realities

* **USB-C port on the mobile device**
  * Your mobile device must have a USB-C port.
  * Your mobile device's USB-C port must support DP alt mode. Not all USB-C ports support DP alt mode.
* **USB-C cable connecting the phone to the tablet**
  * This cable must also support DP alt mode.
* **Compatibility between pen display and a phone**
  * Even if your phone's USB-C port supports DP alt mode, your phone still may not support pen displays. A good example is iPhones. They do not work with pen displays.
  * A pen display may be compatible with some mobile devices but not others. You should contact the manufacturer and ensure which phones they support with their tablets.
* **Power**
  * Your pen display needs power from somewhere.
  * Most likely, your mobile device cannot provide enough power, so you will need a separate power source.

## Specific cases

* [Wacom One 2019 GEN1 (DTC-133) to Android device](https://support.wacom.com/hc/en-us/articles/1500006333362-How-do-I-connect-the-Wacom-One-DTC133-to-a-compatible-Android-device-)
* Apple iPhones — these phones do not work with pen displays.


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