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The mining by phone is possible only for few time. The PI team not made ICO to buy Token, but distribute PI Token for all PI community during the period before the actual release of the currency on the blockchain. The project is slicing in 3 phase. Actually is the phase 2. On phase 3 is no longer possible to mining PI but you can exchange the Token with real PI Coin and exchange with another crypto currency on the market (binance or another one, i dont now again). For more information about the process, it's easyer to go to the web site of PI Network to read the white book and the FAQ. It's very important to read white book before because maybe you will not like this project and in this case you do not take part in this project.
This is true for all (ICO) cryptocurrency

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