[Christopherj84]

I'm on the Orange network and this network supports UMA. When I make or receive calls, the calls seem a bit muffled & crackly.

Does anybody know how to resolve this issue?

[Reed McLay]

If you are getting the UMA indicator and you are not happy with the call quality, check your Wifi Diagnostics for errors.

Connections / Wifi Options. Menu / Wifi Diagnostics.

Have you tested it at other Wifi Hotspots? Is the call quality problem isolated to your Wifi setup?