What is the difference between a digital trunking scanner and a police scanner app on an iphone or blackberry?

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digital trunk tracker scanner device can program listen public safety , other services use digital radio systems or trunked radio systems.

police scanner app on phone can listen online live scanner audio. can not program on app , can listen available online.

hear same thing scanner app @ least 5 10 seconds delayed.

i wondering if hear more digital trunking scanner police scanner app on phone , or whether hear same thing? thanks.


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