I’ve recently been playing with VoLTE on an iPhone to work out the peculiarities of how iOS handles IMS/VoLTE.
While looking for something as in-depth as the Samsung IMS debug tool, I found there’s a field test option on iPhones.
![](https://i2.wp.com/nickvsnetworking.com/wp-content/uploads/2020/03/IMG_0004.png?fit=577%2C1024&ssl=1)
Dialing *3001#12345#* opens up the iOS Field Test Menu,
![](https://i1.wp.com/nickvsnetworking.com/wp-content/uploads/2020/03/IMG_0005.png?fit=577%2C1024&ssl=1)
The options are pretty self explanatory, but it’s a cool feature.