Is it possible to use several mobile phone GPU to mine Ethereum? Advantages are
Mobile phones do not have much memory, but if a manufacturer like Qualcomm made one just for mining will this run or not? Is this a good idea?
No. This is not possible, nor is it a good idea.
Individual computers are often not powerful enough to mine Ethereum blocks. This is why people mine in pools (for example nanopool)
Mobile phones have significantly less powerful processors (and graphics units) so as to keep costs down.
Everything is possible, read up on the scratchpad cache requirements for mining cryptonote algorithms... It's rough. Various other methods exist using other code and platforms to allow any task done in the technical papers on alternative platforms, but if requires a lot of work around and so far, no one has to my knowledge spent the time to write it. I'd love to see Snapdragon and similar mining options as well as make use of limited architecture of mobile GPU. The technical papers breaks down each step in the mining process and cryptographic setup. Unloading some of the work in a cross platform to make use of CPU cycles and GPU cycles both would be interesting to work on... If anyone wants to start the project I'll join and work on it for fun but realize there's no real world case I can see where it'll work with the current code base without significant forking from their intended use case...
https://medium.com/@bitwings/wings-mobile-the-future-of-smartphones-and-cryptocurrency-5e8783619545
They say they have a revolutionary mining cellphone !
