The Android app hasn't been used in many months.
https://www.gpugrid.net/server_status.php
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FAQ's

HOW TO:
- Opt out of Beta Tests
- Ask for Help

They can not even get the AMDs to work satisfactorily, so using and supporting the many different phone GPUs seems highly unfeasible to me. There's also the point of raw power: GPU-Grid needs to get results back more quickly than other projects. They can not spread their work into "infinetly" small packages for many small GPUs. Or more precisely: if they tried to do so, they'd actually hinder the project progress.

If they ever make use of those GPUs it would have to be some fundamentally different application(*).

MrS

(*) Meaning the scientific method and target, not the actual programming.
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Scanning for our furry friends since Jan 2002