This will special mode allows users to find out a range of information about the phone’s connection to the network.

You can however detect what cell tower frequency your phone uses by using Field Test mode. If you are not adverse to doing so there may be an app in the Cydia app store that will show more meaningful information with regard to WiFi frequency information. This answer assumes you do not want to JailBreak your iPhone. I can't provide you an exact process as every router is different.

You should be able to tell via the wireless router your connected to in it's logging functions, WiFi client list or some similar mechanism within the router. When it comes to WiFi analysis, there are comprehensive solutions for Windows and Mac computers, such as NetSpot, which can build a comprehensive heatmap of your network and tell you everything you need to know about WiFi activity in your area.You can not tell from the iPhone directly (as of iOS version 7 native). But how can you tell which channel that is? The answer is simple: you download and use a WiFi analysis tool. The solution is to use a WiFi channel with the least amount of traffic. When too many WiFi hotspots broadcast on the same channel, traffic congestions may occur, and data packets may get lost, leading to connection drops and poor speeds. The WiFi radio spectrum is divided into several channels. But the proliferation of WiFi hotspots also has some negatives. In many ways, it’s great news that wireless Internet access is becoming more accessible. If you live in a larger city, it’s already almost impossible to escape the WiFi signal, and, according to the Wireless Broadband Alliance, total public WiFi hotspots will grow sevenfold from 2015 to 2023, from 64.2 million in 2015 to 432.5 million by 2023. Why Do You Need to Use a WiFi Analyzer App?

Iphone wifi analyzer channel