How is Long SMS Campaigns Charged

The short answer is we charge for each message and message is no more than 160 characters. So if you use 200 characters you will be charged 2*SMS cost for each recipient.

Check for pricing here

https://support.zululabs.com/index.php?/Knowledgebase/Article/View/278/1/sending-a-long-sms-over-160-characters