The questions we get asked most.

What is international SMS, and why does the price vary by country?

What is MO vs MT?

What is sender ID registration, and why do some countries require it?

What is smart encoding, and when does it not help?

What is SMPP?

What is SMS pumping, and how do I stop it?

What is SMS scheduling, and what about time zones?

What is SMS throughput (MPS), and what limits it?

What is the difference between one-way and two-way SMS?