After reaching out to cryptocurrency miners and i also carry out my own research about it, I came to understand that you can mine your BTC using your smart phone, but it's not practical base on it negative effects.
Are they miners from your area or online influencers? The only time I see a "miner" talk about mining with a phone is when they discuss altcoins. Sometimes they use "mining" to refer to farming tokens or even hunting for airdrops. I think it's safe to say you should probably look for better sources to learn if they told you mining Bitcoin with phone is possible.