Hello! We appreciate your interest in our products. That is a USA based single SIM unlocked device. Typically when a device is dual SIM, that will be specified. Please keep in mind that USA devices are designed for use in the USA and we would be unable to guarantee that you would be able to use it without complications in Nigeria. I would suggest you look for an international unlocked dual sim version of the S9 as that would most likely be the version you will need to use in your region. I suggest you keep an eye on your regional official Samsung page at https://goo.gl/yd4NS5 for information on devices being released in your region. We hope this answers your question and helps you with your purchase decision. ^Rod