I have not yet heard of anything about mining through mobile phone devices for I know that basically usage of mining devices such as computers is in need to be done because mobile or smart phones are just a small compact version of computers that is made for convenient usage. But if it would be possible to mine using mobile devices, that will be great for it provide convenience. But still, I cannot barely imagine that mobile phones can already cater mining for the reason that mining process requirea big source of electricity and storage which most commonly computers can only possess. Also, I haven't heard about Pi token and if it was already being listed into an exchange and if it is really worthy to be mined. But still, it is quite interesting if it can really be possible to mine using mobile phones.