I'm afraid it's possible to use Electrum on testnet, but it seems to be necessary to recompile it from source to allow it.

I've also found that Zeus, Phoenix, and Eclair can also work on tesnet.

I'm now in the process of stacking enough t-sats on chain to be able to open a LN channel...

lightning

I'd like to try out LN on Electrum mobile wallet on testnet for a moment before opening a channel on mainnet, but I haven't found the way to create a testnet wallet.  Is that even possible in the mobile version of Electrum?

If not, is it possible with any other mobile wallet?