Text Messages from iPhone 6 are being Received as Separate Messages

Hello,

I have an iPhone 6 that is running iOS 11.1.1, and my friend has a Galaxy S7 phone. When I send her a text message that exceeds a certain length, the message, when received on her end, is split up into multiple smaller messages. I have tried looking into this issue, but I have not been able to find anything about this specific problem. I tried going into my settings and turning on the "Send as SMS" option that appears within the "Messages" section, but that did not solve the problem.

Have any of you experienced a similar problem, and if so, was it an issue with the iPhone that can be easily fixed? Thank you for all of your help. 🙂