devicetype 4 means Phone

When to send it

Send 4 when the device is known to be a phone. OpenRTB 2.2 introduced it together with 5 (Tablet) so that sellers could stop using the blended value 1. App SDKs know their form factor and should report it, and mobile web sellers can usually infer it from the user agent or from the client hints in Device.sua.

Buyers use 4 to pick phone-sized and vertical creative, to apply phone-only targeting, and to price phones apart from tablets. It is confused with 1 when a seller sends the generic value out of habit. The value describes the hardware, not the network: a phone on Wi-Fi is still 4, and the connection belongs in Device.connectiontype.

Example

{
  "device": {
    "devicetype": 4
  }
}

Fields that carry it

• device.devicetype

Other values in device types

The device types list page explains the whole list and its common mistakes.