Fangrui Product Details 1. Our 4g Router Only Support Universal Ordinary Sim Cards. For Some Locked Sim Cards, Contract Sim Cards Which Operators Dont Allow To Work On Wifi Routers , Or Only Allow To Work On Their Authorized Devices. This Product Can Not Work,you Might See It Connected To Local 4g Network , But You Are Not Allowed To Use Internet Service(if Your Sim Card Can Not Access To Internet,pls Dont Be Panic.usually You Change Another Operators Universal Sim Card,then It Will Work) 2. Knowledge About 4g Speed . In Practical Daily Use, 4g Wifi Router Usually Would Provide 1 - 20 M/s Download Speed For Wifi Users.its Enough For Ordinary Users To Watch Video,play Games ,etc Smoothly. 3. Routers 4g Chipset Top Capacity Is 150m, And 4g Base Stations Theoretical Top Speed Is 150m Too.however The 4g Base Station Provide Service To Many 4g Users At The Same Time, Instead Of Giving Full 150m Bandwidth To One User,and 4g Signal Strength,sim Card Limitation And Environment Would Affect The Network Speed Too.if Some User Eager For T