How to verify sms/mms

Try this easy 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.

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.

this is not really a problem but understanding should be clear:
Multimedia Messaging Service(MMS)

MMS is a descendant of SMS (Short Messaging Service). MMS extends text messaging to include longer text, graphics, photos, audio clips, video clips, or any combination of the above, within certain size limits.

MMS is frequently used to send photos and videos from camera phones to other MMS phones or email accounts. Most camera phones have MMS, but many non-camera phones have it as well.
if it has a photo, video or audio it will automatically be categorize as MMS
While SMS stands for short message service. SMS is also often referred to as texting, sending text messages or text messaging. The service allows for short text messages to be sent from one cell phone to another cell phone or from the Web to another cell phone. purely text:
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This could only be caused by a couple of things. The message center number in the handset may not be correct, which will cause the messages to fail. The other possibility is that the feature is not active on your account with your wireless provider. What you need to do is test a couple of things. See if you can send a text/sms message to yourself, in doing this you can verify that you can not only send, but receive text/sms messages. If you cannot send, or receive text/sms messages, then that verifies that the message/service center number is off, and will need to be corrected. If that works, and you can receive text/sms messages, then your service center number is correct, and you will move to the next troubleshooting step, which is to test your web browser. If you cannot launch the web browser on your handset, then this is an issue, because the MMS service requires that you have both SMS, and web browser service to send a MMS message. If you can access the internet and you have the ability to send/receive text/sms, then you need to call your service provider as the issue may be with their service.

If you are sending sms ideally it should not show anything like you require GPRS. But for sending MMS services you require MMS services activated and MMS settings on your phone. Some service providers need GPRS to be activated if you want to send MMS and some needs MMS services activated. Please call customer care and ask them regarding MMS Services and activated a good plan then try to send Messages. I believe this solution will help to resolve the issue.

If there are too many SMS messages in your phone it will start sending all messages as MMS. All you need to do is delete some of your texts.

Hi
there are only settings on the phone that will stop sending of messages, settings will not stop the receiving of messages (unless their mms - picture messages). I would suggest you speak to your network as it maybe something on your account at their end that needs fixing?
Incoming mesages (sms) are directed at your mobile number so the phone will receive them as you do a call.
Let us know how you get on?

Do you want to sent mms/sms. for sending mms you need to suscribe from your operator and save mms settings on your mobile.
For sms check your message center number with your network provider and input the number in your message setting option.

erase your inbox and outbox messages. Change the settings to remove messge after 10 days or less.