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SMS communications incur a minimum additional cost of 12c per SMS. Different symbols and languages can result in increased text length. SMS messages are charged at a flat rate of 12c per segment, with one segment equivalent to 160 characters.
Coupon and other links will add to your character count. Use of {{coupon_link}} within SMS communications can add up to 112 characters to your SMS.
To calculate the length of your SMS, use the Twilio message segment calculator.