SMS is out there being an include-on to US compensated options only and SMS credits are additional for your account after obtain. Application and arrangement to conditions is needed right before purchasing credits. Credits are issued month to month and unused credits expire and don't roll over. Pricing varies. See https://cost-per-thousand-cpm41851.qowap.com/87685176/the-2-minute-rule-for-cost-per-action-cpa