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In general, how can I know whether my 4G phone with a non-stock ROM still has 4G functionality?

I've read in various forums and how-tos that rooting and flashing a new ROM on your 4G Android device may disable its 4G functionality. These forums say that 4G working all depends on which device, rooting method, radio driver and ROM you use.

For example, I have an HTC Evo 4G with MIUI.

Model: PC36100
Android: 2.3.7
Kernel: 2.6.37-cyanogenmod-01493-g70877de, shade@toxygene #1

In my settings, I have options to switch from 2G to 3G, but I don't see anything in the menus that even recognizes the existence of 4G. However, that doesn't necessarily mean 4G doesn't work, but I can't seem to find this information anywhere on the internet. So how can I know whether my 4G phone with a non-stock ROM still has 4G functionality?

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closed as too localized by Izzy, t0mm13b, ce4, Liam W, Bryan Denny Dec 21 '12 at 15:58

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

I can tell you right now that MIUI doesn't support the EVO's WiMAX radio. I don't know if this would be helpful enough to be an "answer" but your observation is basically how you can tell. If there's no 4G or WiMAX settings, it doesn't support it. – eldarerathis Dec 27 '11 at 1:09