Cant forward text or mms messages after receiving them

Try this steps:

Restart your iPhone
Check your network connection. To send a message as iMessage or MMS, you need a cellular data or Wi-Fi connection. To send an SMS message, you need to have a cellular network connection. If you turn on Wi-Fi Calling, you can send SMS messages over Wi-Fi.
Check with your carrier to see if the type of message you're trying to send, like MMS or SMS, is supported.
If you're trying to send group MMS messages on an iPhone, go to Settings > Messages and turn on MMS Messaging. If you don't see an option to turn on MMS Messaging or Group Messaging on your iPhone, then your carrier might not support this feature.
Make sure that your device has enough space to receive images and videos.
Make sure that you entered the correct phone number or email address for the contact.

R U using microsoft Word or what......?????

The iPhone doesn't support MMS messaging which includes videos, pictures and sound, it only supports text messages. You can email the photos to someone or yourself to get the pictures off your phone on the go.

with an MMS-enabled phone you can:
Take digital photographs and store photographs on the Internet Send and receive full colour pictures Send and receive voice clips Add a text message to your picture Purchase pictures and sounds from the Internet Have enhanced polyphonic ringtones
MMS runs over GPRS. You normally need to subscribe to a GPRS tariff, and have 'Media Messaging' enabled by your network operator. You will need a phone handset that supports the MMS service - If you receive an MMS message and don't have a suitable handset or GPRS service, you'll receive a standard SMS text message, and will be able to view the message at the web address included with the text message.

If you wish to manage a specific message in the history, you can press and hold a message to bring up options such as forward and delete as well as view details. The options to copy the text of a message or edit a message have been removed.

Try inserting a sound or a picture while forwarding, that will change it to mms

To enable MMS on your iPhone 3G you just need to go to
Settings >> General >> Network >> Cellular Data Network



Then Under MMS, enter the following details:

• APN: wap.voicestream.com
• Username: leave blank
• Password: leave blank
• MMSC: 216.155.174.84/servlets/mms
• MMS Proxy: 216.155.165.50:8080
• MMS Max Message Size: leave blank
• MMS UA Prof URL: leave blank

Once entered, reboot your iPhone.
Go to Messages. There you will find the sweet little camera icon to the left of the text input box.

Congratz you have enabled MMS on iPhone 3G OS 3.0 for T-Mobile. You can use that icon to send Pictures, Audios and Videos to your loved ones at the same price as of a Text Message means NO additional charges for MMS on T-Mobile Network.
Cheers!

u upgrade u r iphone firmware to 3.0 or higher , then you can forward messages to your friend

Yes! there was upgraded software I just downloaded on itunes site this morning and FINALLY you can forward a text msg now! Just log in to itunes and download the updated software.

The iPhone doesn't support MMS messaging which includes videos, pictures and sound, it only supports text messages. You can email the photos to someone or yourself to get the pictures off your phone on the go.

Here is a thread explaining the problem and the workaround if you are interested.
http://www.iphonefaq.org/archives/97158