Why has my text message length reduced to 70 characters? How to I get it back to 170?

My text message length has reduced from about 170 per text to 70. It seemed to happen after I altered the keyboard language from English to Polish and back to English, but that might be coincidental. I have looked at the settings menu and can't see anything that may be of help. I am =in the UK and have a Samsung Galaxy Ace 2 and my network is Orange (EE).

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