I discover this guide while reading on how to start mining! How true is this?
The first step to mining Bitcoin at home is to build or purchase a mining rig. A mining rig is a computer specifically designed for mining cryptocurrencies. It will typically consist of multiple GPUs that are capable of performing complex mathematical calculations at high speeds.
Bitcoin mining used to be mined with CPU then GPU, but with the creation of ASICs, GPU mining is proven to be obsolete in mining Bitcoin but if there are cryptocurrency out there that can be mined with GPU so if you plan to use GPU as a mining Rig then better forget about mining BTC instead check this site:
https://whattomine.com/ for possible profitable gpu mining.
Can I start with my smartphone?
The only way you can use your smartphone to start mining cryptocurrency is through a mining app. These mining apps put you in mining pools, i.e. groups of other miners, that utilize the hardware present inside your smartphone to mine cryptocurrency at a specific hashrate.
If you know much better please what is missing here, so we can learn?
How to mine Bitcoin at home
cointelegraph.com › news › how-to-mine...
As panganib999 stated, anything that has processing power can mine cryptocurrency but the problem is profitability. Mobile phone cannot compete with other mining rigs, more or less those who said they gained a good amount of Bitcoin on mobile mining are instead is engaged in cloud mining and the mining apps is just a tool to simulate their mining activity.