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# SMS Dictionary Key Constants

Read the parts of an SMS message.

## Topics

### Sender Information

[`IOBluetoothPDUOriginatingAddress`](/documentation/IOBluetooth/IOBluetoothPDUOriginatingAddress)

The phone number for the sender of the text message.

[`IOBluetoothPDUOriginatingAddressType`](/documentation/IOBluetooth/IOBluetoothPDUOriginatingAddressType)

The format of the phone number for the sender of the text message.

[`IOBluetoothPDUServicCenterAddress`](/documentation/IOBluetooth/IOBluetoothPDUServicCenterAddress)

The phone number for the service center that stored and then delivered the message.

[`IOBluetoothPDUServiceCenterAddressType`](/documentation/IOBluetooth/IOBluetoothPDUServiceCenterAddressType)

The format of the phone number for the service center.

### Message Information

[`IOBluetoothPDUProtocolID`](/documentation/IOBluetooth/IOBluetoothPDUProtocolID)

The protocol of the text message content.

[`IOBluetoothPDUUserData`](/documentation/IOBluetooth/IOBluetoothPDUUserData)

The content of the text message.

[`IOBluetoothPDUTimestamp`](/documentation/IOBluetooth/IOBluetoothPDUTimestamp)

The time the text message was sent.

[`IOBluetoothPDUType`](/documentation/IOBluetooth/IOBluetoothPDUType)

The GSM type of the text message.

[`IOBluetoothPDUEncoding`](/documentation/IOBluetooth/IOBluetoothPDUEncoding)

The encoding for the text message.


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