When i connect to band 1 in b818 it doesn't show any signal. I have TP-Link mr600 and band selection is auto and it shows 4G+ and when I download anything it shows band 3,1 in TP-Link settings and download speed in mr600 is 120 mbps , in b818 download speed is between 50-70I assume you can activate B1 and B3, individually, and connect to both? Do their CellIDs translate back to the same site/eNB? My guess is that they won't have your B1 comes from a more distant/lower metrics site than the B3 does and when enabling both you get only B3 from the closer/higher metrics site.