IMessages on iPhone, turned them off and can't turn them back on again

My friend turned off her iMessages on her iPhone and now she can't turn them back on again!

Well you turn it on in the settings, thats really all there's to it.

If the iMessage service will not turn back on (if it just keeps saying "Waiting for activation") then try restarting the iPhone by turning it off and then back on. To make sure that the iMessage will be activated again, make sure the phone is in a GOOD SERVICE AREA. This is important. You need between 4-5 bars of service. Then do the following:

Settings < Messages < iMessage "ON"

And if the iMessage is grayed out, you have to enable changes in "Restrictions"

Settings < General < Restrictions < Accounts "ALLOW CHANGES"

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