Why do we need 4g sim slot in car android system?

4g slot   Dan slot gopay 5000

slot labelled WWAN1 Then remove the WWAN card holder from the system board You've

Find Best Price, Quotations, Address, Contact Number, Reviews and Ratings of Verified 4g Wifi Router With Sim Slot Dealers, Manufacturers & Suppliers in Orange Box CPE MT303 4G ROUTER with SIM Card Slot, Wireless Router CPE Jio Router

davinci diamonds slot play 4g sim based wifi router with calling features plug n play Call Now WhatsApp Get Price Company Information PRS Surveillance System  VoLTE 2 is showing as Jio is in my second slot I can make calls and data from any sim I want On other mid range phones, Whenever you are using a non pure 4G