What are some alternatives?
When comparing CopperheadOS and Ubuntu Touch, you can also consider the following products
LineageOS - Operating system for smartphones and tablet computers, based on the Android
Replicant - Replicant is a distribution of Android that is 100% Free Software.
MIUI - Xiaomi MIUI Official Global Site. MIUI is a customized Android ROM developed by Xiaomi for smartphones and tablets. MIUI Forum offers ROM downloads for 251 devices including Mi 6, Mi MIX 2, Redmi Note 4 and others.
Android - Android is an open source mobile operating system initially released by Google in 2008 and has since become of the most widely used operating systems on any platform.
Resurrection Remix OS - Resurrection Remix ROM is ultimately full featured, stable and combined with the best features of...
AOKP - AOKP stands for Android Open Kang Project. It is a custom ROM distribution for many Android devices.