This quickie will get you up and running if you need to display the android built in contact picker to select a phone number with a minimum amount of code.
This Immerse headset from ThumbsUp offers both positive and negative sides.
You might have the best app ever created, or you might have the user friendliest web page in the world. You might even have the most useful piece of shareware ever made and still not making any money.
According to an email DroidXplorer will be preinstalled on devices, and be featured on a set of app stores. For free.
Send complex data in the custom field that you use to match a payment with a customer, order or whatever you need.