Portable Wireless Motion Sensors?

My friend has me watch his house quite frequently when he goes out of town and I often stay at his house for him to watch it as well. Most of the day I'm busy working and running errands and I was wondering if there's some type of system where I can setup portable wireless motion sensors and/or security cameras around the house that can alert my iPhone or send me an email or text if there's any activity? His house does not have an alarm system and is not in the greatest area of town so I was wondering about this. Any ideas?

You can buy what you need on the web. There are hundreds of systems available.

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