Based on the information in your post, one solution may be to code a custom LAP (Local Athentication Protocol) plugin for the customer. A LAP is the underlying technology that is used when the user needs to unlock the device by entering a password.  It's possible to implement a custom LAP and override the default behavior to "automatically" unlock the device when an incoming phone call is pending (as long as the incoming call be be detected). I've had to implement a custom LAP for another customer to override the default lock behavior.  For this customer, the security protocol was enabled by the Exchange Server.  They wanted our devices to not be locked while standard PDA's would be authenticated. If you want to include me on a conference call with the customer to discuss this approach, contact me directly.  This is the sort of work my group at Motorola performs under the aegis of ECRT.