Spoke to TP Link prior to purchasing this and they confirmed that it would work using the SIM card I had in my Huawei 315s and my Spark RBI plan. Yeah, right. Sad though, looks like a great router, nice interface to control all kinds of things, and well built. So, if you are looking to replace the cheapo router you typically get with RBI plans, and you have kids at home on lots of devices, you'll need to be careful. This one will do the trick if yo can connect to your ISP.