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Depending on implementation, OTA software delivery can be initiated upon action, such as a call to the provider's customer support system or other dialable service, or can be performed automatically. Typically it is done via the former method to avoid service disruption at an inconvenient time, but this requires subscribers to manually call the provider. Often, a carrier will send a broadcast SMS text message to all susbcribers (or those using a particular modél of phone) asking them to dial a service number to receive a software update.

Verizon Wireless in the U.S. provides a number of OTA functions to its subscribers via the *228 service code. Option 1 updates phone configuration, option 2 updates the PRL.

OTA by SMS is not limited to cellular network operators. OTA messages may

also be generated by third parties and sent directly to the handset. For

example, UK VoIP operator aql uses an OTA configuration message to

automatically configure the SIP VoIP client on Nokia's E-Series handsets

when users sign up for their mobile VoIP service.

To provision paraméters in a mobile device OTA, the device needs to have a provisioning client capable of receiving, processing and setting the paraméters. For example, a Device Management client in a device may be capable of receiving and provisioning applications, or connecticity paraméters.

In general, the term OTA implies the use of wireless mechanisms to send provisioning data or update packages for firmware or software updates to a mobile device - this is so that the user does not have to go to a store or a service center to have applications provisioned, paraméters changed or firmware or software updated. Non-OTA options for a user are a) to go to a store and seek help b) use a PC and a cable to connect to the device and change settings on a device, add software to device, etc.