Text message is being divided into two messages I use a pre-paid cellular service from T-mobile. Each text message is deducted from my account at a preset rate.

Too often, a text message I receive of 100 or less characters and spaces is broken into two texts, meaning I get hit for 2 texts instead of one. So for example, a 100 character &amp; spaces text will arrive as a 60 character text and a 40 character text.

Is there anything I can do about this and still keep the same service?
Why are texts being divided if they are under the total character &amp; spaces length of 130?
A single SMS can hold up to 160 characters. But that's only for text. 
Since smartphones make a lot of use of emojis, the SMS cannot hold 160 characters anymore if you include an emoji. AFAIK, the default emoji (smiley) will take 2 characters, but the one with a custom skin tone can take 4 characters. Similarly, it varies from device to device and what kind of emoji it supports.