5t4ke2011

I don't know what is available for regtest on android and IOS. The electrum source code seems to have you covered, if you are willing to put some effort:…

I did the same in the past, regtest works great. You just need one node. It might also be useful to also setup an electrum server on regtest. With a watch command, you can easily set a shell to mine for a block every X…