Problems updating iphone 5 to ios 7
We suggest trying a process of elimination to see if i Message works with just your mobile number or just an email address.Also check there is a tick beside your phone number in the Start New Conversations From section if you're using an i Phone.
As an alternative to Apple's page, you could try Down Detector, which provides a graph detailing outage reports from the past 24 hours, and even an outage map to see whether you're in an affected area.
That last tip will only work with an i Phone, though.
For more information on how to do this read: How to send a text when your friend isn't getting your i Messages.
i Message - accessed via the Messages app in i OS or mac OS - enables users to send messages to other people using i Phones, i Pads and Macs for free.
i Messages are indicated by a blue bubble, while normal text messages (which you might have to pay to send depending on the terms of your phone contract) are green.