Let me tell you how to use an idle phone to create a secure and reliable cold wallet.

First, let's talk about what a cold wallet and a hot wallet are. A hot wallet generally refers to a wallet on a mobile device, a browser extension wallet, or a desktop wallet on a computer. The advantage of such wallets is that they are very convenient and efficient, while the downside is that they are prone to leaking your mnemonic phrase or may allow virus software to be downloaded onto your phone or computer, leading to the exposure of your mnemonic phrase and resulting in asset theft.

A cold wallet refers to a situation where, in most cases, your device is offline or a physical cold wallet sold by professional issuers. The advantages of this type of wallet are security and reliability, making it almost impossible for assets to be lost or stolen. The downside is that it is relatively inconvenient, as you must physically store your handwritten mnemonic phrase.

I have roughly explained the advantages and disadvantages of cold wallets and hot wallets.

*Without further ado, let me explain in detail how to use an idle phone to create a cold wallet. First, prepare an idle phone, then download any wallet from a secure and reliable official website. After the wallet is downloaded, create a mnemonic phrase while offline. Once the mnemonic phrase is created, write it down by hand.

Then enter the wallet interface and copy the wallet address you just created for receiving coins. It can be either TRC20 or ERC20. Then download a wallet on your frequently used phone that is the same as the idle phone, or any wallet that has an address observation function. Click on 'Observe Address' on the wallet creation page. In the future, when you want to transfer assets to the cold wallet, just record the previous address. You can check the wallet account's fund status through the address observation function on your frequently used phone. When you need to transfer coins, simply turn on the hotspot on your frequently used phone to transfer to the idle phone. This way, you achieve the functionality of a regular wallet while ensuring the security of a cold wallet.