Classic car alarm systems?

Yesterday, I walked out of the house only to find a truck backing its enclosed trailer up to the front of the Duster.
When they saw me they stopped and immediately drove away.

So I am looking for suggestions on a alarm system for a classic car. Preferably one that will interface with a smart phone

What a bunch of cunts. ******* hate thieves. My suggestion; viper alarms can connect to your phone, and they go off real easy. Id also make sure you have theft coverage