Systems and methods provide for receiving a cell signal of a frequency band via a 5G/New Radio (5G/NR) carrier, wherein a user device includes a 5G/NR modem and a 4G/Long Term Evolution (4G/LTE) modem; determining that the frequency band is a shared spectrum carrier; forwarding the cell signal from a radio frequency (RF) element of the user device to the 5G/NR modem and the 4G/LTE modem; using, based on the forwarded cell signal, the 4G/LTE modem to identify one or more RF signals from one or more cells, wherein the one or more RF signals include a 4G/LTE carrier in the frequency band; and directing the 4G/LTE modem to notify the 5G/NR modem of the one or more RF signals.