Top-up
The approved marketing SMS top-up is 500 segments for $10. OperMae does not charge that top-up automatically, and it does not replace the included monthly allowance.
Before you buy
Settings → Billing shows the included allowance, how many segments are used, how many remain, purchased capacity, the additional 500 segments, and the $10 price. The charge happens only after you confirm. Overage billing stays off unless you approve it.
What is not sold
A 100-segment pack is not sold. An email pack is not sold. Appointment texts are not sold as a pack.