How do I fix my phone converting sms to mms?


    Recently, I purchased Samsung Galaxy J7.  When I try to send text messages, the device is set to MMS only.  It shows that I have 1000 symbols to use.  However, I am trying to text to someone who does not have data plan or Wifi to open MMS.  I looked all over the Internet, but I could not find a solution to this problem.  I used to have LG phone and never had this problem before.  Is there an easy solution to this problem?  I do not want to install an app for sending text messages.  I know about Handcent and Go SMS Pro, but I prefer the native app.  I am still hoping that I can get this fixed on my phone.  Thanks in advance.

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