I think I agree with the hacker new hivemind, but I think I formed the opinion separately. I did a few small transactions with bitcoin ages ago, and it was a huge pain. Buying the bitcoin was painful, and then I couldn't send an exact amount, it's better to receive change to a different address, and the fees weren't as cheap as I expected for small amounts.

I often hear this has been solved with additional layers, and I see that you mentioned Ethereum instead of bitcoin. Is that significantly easier? $0.25 is not bad for $10, so the fee seems fine. I'm accepting money in an envelope as a solution, and that costs more, but I'm keen to hear whether this would have been easier.

Bitcoin maximalists have purposely ruined the cheap transactions on Bitcoin (in order to sell their own centralized solution) by limiting the block size. If everything had gone according Satoshi's original plan, we would have transaction fees in cents today. That's why I mentioned Ethereum, because it's eating Bitcoin's lunch in cheap transactions and contracts.

If you ignore parts the transaction sure it is cheap. What can I do with USDT? no shop near me would accept it, most major digital commerce stores like Amazon won't accept it, my bank won't accept deposits in USDT.

If I have to start and end with USD which is what anyone interested in other three functions of money want, there is USD -> USDT and back to USD costs, and depending on geography there may not be cheap or legal way to make that trade, which means it is going to be far more expensive than just the $0.25 "gas" fees.

Go to a site like bitrefill and buy a gift card for any store where you want to spend it. I often buy Amazon, Uber, Apple, etc. cards from them. Pretty straightforward. Obviously they might not support any stores in your country, but they seem to have a wide reach. And they are not the only ones in the game.

I'm fine with that solution, how can I store the $10 safely in that case?

Download a wallet on your phone, I guess. As long as you are not downloading unverified APKs left and right, your 10$ should be pretty safe. I can even bet a 10$ on it!

What happens if my phone gets bricked?

I guess you'll be more worried about a $200-$4000 phone over $10. If you are planning to get hundreds or thousands of dollars worth of crypto, buy a hardware wallet. They are hack proof and you can write down the seed phrase as a backup in case the wallet bricks.