I have purchased imatch but my phone keeps indicating I have not subscribed.

Hi ccstar,

Welcome to the Support Communities!

Is it possible you have not setup iTunes Match on your iPhone yet?

The article you referenced explains how:

iTunes: How to add a computer or iOS device to iTunes Match

http://support.apple.com/kb/HT4913

To add an iOS device to iTunes Match

1. On your iOS device, go to Settings > Music
2. Tap the iTunes Match switch to On.

If you are still having issues with this purchase, report it here:

How to report an issue with your iTunes Store, App Store, Mac App Store, or iBookstore purchase

http://support.apple.com/kb/HT1933?viewlocale=en_US

Cheers,

Judy