Cellular connectivity is where the two phones diverge most fundamentally. The Honor 400 5G supports 5G, with peak download speeds up to 5000 Mbits/s, while the Honor X7d 4G is capped at 4G LTE with a maximum of 390 Mbits/s. For users in areas with 5G coverage, this translates to dramatically faster mobile data — streaming, large file transfers, and cloud-dependent tasks all benefit. The 400 5G also supports Wi-Fi 6 (802.11ax), adding lower latency and better performance in congested networks, whereas the X7d 4G tops out at Wi-Fi 5.
The sensor and feature gap extends further. The 400 5G includes a gyroscope — essential for accurate gaming controls, AR applications, and image stabilization assists — which the X7d 4G lacks entirely. It also carries an infrared sensor, enabling the phone to function as a universal remote for TVs and appliances, a convenience the X7d 4G cannot offer. On the Bluetooth side, the 400 5G's Bluetooth 5.4 is a step ahead of the X7d 4G's Bluetooth 5.0, offering improvements in connection stability and efficiency.
Both phones share NFC, dual-SIM support, USB Type-C, GPS, and a fingerprint scanner, giving them a common baseline for everyday connectivity. But the cumulative weight of the 400 5G's advantages — 5G, Wi-Fi 6, a newer Bluetooth version, gyroscope, and infrared — makes the verdict clear. The Honor 400 5G wins this category decisively, offering a materially more capable and future-ready connectivity package.