If you live in urban areas such as NYC, upgrades are important because of signal interference from skyscrapers, subways, below-ground parking garages, basements

If you live in urban areas such as NYC, upgrades are important because of signal interference from skyscrapers, subways, below-ground parking garages, basements,and tower congestion etc. The improvement in modems (eg, now X65 going to X70 Qualcomm) and transceiver electronics are improved as well as battery life. I yearly upgrade primarily but not only for that reason. The newer modems are particularly good at weak signals, eg, < 120 dBm. I use Verizon and use iPad Pro and Apple Watch also on cellular. Works really well together.