Is it possible to display Wi-Fi channel availability or 3G signal strength together with additional details?

For security/privacy reasons (wifi network names or cell towers could be used by app developers to locate your device, the wifi security type could be used to find networks with weak encryption, etc.), iOS provides very little information about the connected/available wifi or cell networks. For this reason, the following features (available, e.g., in the Android version of the app) cannot be implemented under iOS by third-party developers:

wifi signal strength/coverage (RSSI) meter
channel number availability finder
SSID or hidden SSID finder
wifi security type (WEP, WPA, WPA2, AES, TKIP)
transmit rate
PHY mode (b/g/n/ac)
MCS index
frequency (2.4GHz, 5GHz)
cell tower list
cell tower signal strength data

If Apple ever makes this information available to developers (which I find very unlikely), I'll immediately add support for it in my apps.

Note: It is possible to use Apple's own Airport Utility app (which, being developed by Apple, doesn't have to follow the restrictions third-party apps do) to show surrounding wifi networks, their signal strengths, and the channels used. For more details see https://wifi.rainbird.com/wp-content/uploads/2018/12/Using-Airport-Utility-to-Scan-WiFi-Network-Signal-Strength.pdf