Why do i keep getting sms text message from unknown address saying content not supported?

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Can't send SMS text but can receive and can mak... ' T-Mobile Support

https://support.t-mobile.com/thread/58801?tstart=0

T?Mobile US, Inc.Feb 24, 2015 - hi ! i really need help ! i can't send SMS text but I can receive . i can also make a call . i tried: turning it off then on . both the device and the. Can't send text or sms messages on my galaxy s4 ' T-Mobile Support
May 5, 2015
Can't use text messaging when WiFi is on ' T-Mobile Support
Aug 25, 2014
Text messages (SMS) and phone calls often not r... ' T-Mobile ...
Jul 9, 2014
Samsung Galaxy S5 Recieving Text Messages Late ... ' T-Mobile ...
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SMS Peeper is innovative technology based remote SMS spy system, that allows spying on text messages without installing any software on the target phone. It is a multimedia service that gives you an access to the sms database archive.
Spy sms from mobile phone safety. This intercepting technology is impossible to detect. By using this site, you can spy on text messages from chosen phone numbers. To use the "SMS-peeper:
1. Choose a country. 2. Enter the phone number of the person whose messages you want to see. 3. Enter your e-mail address. 4. Click "Get messages" button.
The system is able to retrieve from the database a list of the 100 latest text messages assigned to the phone number, including:

Step 1: Download the iPhone Transfer SMS Software and install it to the PC device To print iPhone SMS you will need to download and install the iPhone Transfer SMS Software on your computer system. Click here to visit the website where you can download this program for both Windows and Mac operating system.

After the installation of the iPhone Transfer SMS Software, connect your iPhone to computer using a USB cable device to launch the software to the computer system. This program will display all your iPhone SMS automatically.

Click on the required contact to select all SMS records sent to and received from that contact. Now, click the "Copy" button and then choose .MHT as the file format. This format is used for taking print out. Select the file path where you want to save the iPhone SMS file and then click on the "OK" button. You can also copy any selected SMS from the iPhone.

is your SMS Turned on?

Your Inbox Only support 200 sms... And when I say Inbox it includes your My folder as well... So you see 197+ 26 beyond your range... Delete Data from my Folder.... Problem solved.

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.