Does anyone know how to obtain a 4g Lte SIM card for a router/modem such as an Asus or mofi. AT&T, Verizon, spirit basically all the main phone companies will not let you use their SIM card unless it's a product of theirs. Next question is why would companies make wireless hotspots if you can't use their product. Is there something I'm missing or am I just stuck with whatever router/modem they provide me? Also can you purchase static IP address for 4g Lte internet through AT&T who i have right now. I've went through hours of phone conversations with at&t about purchasing a static IP for this home base and everyone seems to be lost. I need some help on this because nobody has any answers what so ever and it's bothering me no one knows anything about this subject. Thanks