# sms

- [What is international SMS, and why does the price vary by country?](/explained/sms/what-is-international-sms)
- [What is MO vs MT?](/explained/sms/what-is-mo-vs-mt)
- [What is sender ID registration, and why do some countries require it?](/explained/sms/what-is-sender-id-registration)
- [What is smart encoding, and when does it not help?](/explained/sms/what-is-smart-encoding)
- [What is SMPP?](/explained/sms/what-is-smpp)
- [What is SMS pumping, and how do I stop it?](/explained/sms/what-is-sms-pumping)
- [What is SMS scheduling, and what about time zones?](/explained/sms/what-is-sms-scheduling)
- [What is SMS throughput (MPS), and what limits it?](/explained/sms/what-is-sms-throughput)
- [What is the difference between one-way and two-way SMS?](/explained/sms/what-is-the-difference-between-one-way-and-two-way-sms)