Cannot send message, iMessage needs to be enabled to send message? Iphone 4S

MMS on Iphone usually turned on by default. You may also use Imessage instead.

Turn on MMS
1. Open Settings.
2. Tap on Messages (it should be about halfway down the column that starts with "Passwords & Accounts").
3. Scroll down to the column with the heading "SMS/MMS" and if necessary tap on "MMS Messaging" to turn the toggle green.

Make sure to turn off Imessage before using MMS
1. Open Settings.
2. Tap on Messages (it should be about halfway down the column that starts with "Passwords & Accounts").
3. Tap on iMessage so the green toggle goes to gray.

Follow these detailed steps , and you can remove phone number from iMessage.
1. Remove phone number from iMessage on iPhone
Step 1: Make sure your SIM card is in your iPhone. And turn on your Iphone, then open Settings.
Step 2: Tap Messages.
Step 3: Tap "Send & Receive".
Step 4: Turn iMessage off.




Of course, if you no longer have the iPhone, or maybe you drop it to your bath tub and it's no longer functioning, this is not an option, which means you'll have to go another route.
2. Remove phone number from iMessage online with Apple's "Deregister iMessage" service
Step 1. Go to Apple's dedicated "Deregister iMessage" service. By the way, you can enter into the Apple website to seek for the "Deregister iMessage" service.

Step 2. If you no longer own the device, find the "No longer have your iPhone?" menu. Enter the phone number you'd like to de-activate from iMessage and click Send Code.

Step 2. Check your current phone for a text message and enter the code that you're sent. Wait for a bit and you should get a confirmation that your phone number has been deregistered.

For more details, check: How to Remove Phone Number from iMessage?

What OS are you operating?

If you open the Settings app on your iPhone, select Messages, and set the iMessage slider to the off position, you will no longer send or receive iMessages on the iPhone. However, depending on your situation, you may end up not receiving text messages from iPhone users. Additionally, if you have multiple Apple devices, the iMessages will still be delivered to your other devices. This is usually not desirable because you want messages sent to your phone number to be delivered to your iPhone.

Check this link for details:

Why Am Not Receiving Text Messages From iPhone Users iAnswerGuy

This is probably because you are using iMessage. You can disable it on your device in Settings > Messages.

I get a lot of good info, correction: GREAT info from the Bimmerforum. Link below:

http://www.bimmerforums.com/forum/

The user NOT receiving the message needs to go to settings for Messaging and turn iMessage off then on again. It has to show 'Receive messages at' settings with either phone number or email address. The phone will sometimes fail to automatically do so.

If you have back up your text messages, you can restore from the backup.

To restore information from a backup, use one of the following methods after connecting your iOS device to the computer with which you normally sync:
1. Right-click (or Control-click) the device and choose Restore from Backup
2. If you have a new phone, you can connect to iTunes and it will prompt to restore from your backup
Solution from Apple.com: http://support.apple.com/kb/ht1766

If you have no backup for your data on iPhone, iPhone data recovery software is your last shot! I used Tenorshare iPhone Data Recovery and it worked well. Download it from http://www.any-data-recovery.com/product/iphone-data-recovery.html It's easy to use. Just a few clicks you can get all your data back.

Solutions from iPhone SMS Recovery
How to Recover Deleted Text Messages from iPhone

The only time i've heard of this happening is when the data plan is turned off on the phone. If she's able to send photos through iMessage while on wifi then that might be the case, if data isn't turned off on the phone then i am unsure of the issue

Can she send them?
Under
Settings - Messages
Set the first three switches to ON
Ensure the 'Receive At' setting has the phone number and primary email set.
Now toggle iMessage to off, restart the phone, toggle iMessages back on.

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