English Characters:
In the case of English, the character limit for single SMS is 160 Characters. In this case, Message count and SMS count will be 1.
If the limit is crossed, say 180 character then it will be considered as 1 Message but 2 SMSes.
In the case of more than 1 SMS, per SMS character count is reduced to 153 characters.

Multilingual Characters:
In the case of Multilingual Characters(Non - English Character),the character limit for single SMS is 70 Characters. In this case, Message count and SMS count will be 1.
If the limit is crossed, say 90 character then it will be considered as 1 Message but 2 SMSes.
In the case of more than 1 SMS, per SMS character count is reduced to 67 Characters.

Even if a single character is Multilingual in an English characters, the whole SMS will be calculated as per the Multilingual character count logic.