1. A single message can accommodate up to 1600 characters. However, the cost of an SMS is calculated based on 160 characters per SMS, which means if you send a single message of 1600 characters, it will be equivalent to 10 messages, cost-wise.

  2. The character limit for templates is 600 characters, giving you more flexibility to create longer and more detailed messages.

    Note: This update applies only to SMS templates. Standard SMS messages will still have a 160-character limit.

    For outgoing SMS charges please refer this 
    link