How can I send data from a PHP file to an Android handset that is not connected to my computer?

How can I send data from a PHP file to an Android handset that is not physically connected to my computer?

I only know the number and IMEI number.

I have a string generated by the php file in the browser (whose value is 1011, 1000, 1111 for example). I want to send this string to particular person who has androi开发者_开发问答d sets with them.

There are so many different ways and different tutorials, here's one or just google android httpClient.

How-to: Android as a RESTful Client