Since I started this thread I thought I would post a follow up now that I have finished and published the app. My app is a broadcast listener that kicks off on receipt of an SMS message. Under the right conditions it launches an activity that runs for 30 seconds getting reading from a location listener. It then sends results back to the sender containing the desired data and finishes. I have tested it while the target phone is running all sorts of apps such as a continual animation test app, talking on the phone, taking pictures, an app in a timer loop timing each execution. Even my other app that uses location listener constantly was not affected. I've done this on phones running 2.33 to 4.2. None of these tests even noticed my app executing. It's a free app "WhereAreMyKids Trial". Have a look yourself. It's on Google Play. Gary
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