Machankura is a lightning wallet that runs on basic mobile phones (non-smartphones) without internet using 

It appears they have a self-custodial smartphone version now.

bitcoin

bitcoin_beginners

bitdevs

Machankura just activated the Self-Custodial mode [Testing]

hasherstacker

https://stacker.news/items/60746

Machankura is a lightning wallet that runs on basic mobile phones (non-smartphones) without internet using [USSD](https://en.wikipedia.org/wiki/Unstructured_Supplementary_Service_Data) which is kind of like SMS.

It appears they have a self-custodial smartphone version now.