What's the joke about buying a mobile phone for the dead?

Qingming Festival is approaching, my colleagues went to buy sacrifices and saw an Apple mobile phone made of paper. Some people disagree: Aha, burn an Apple phone? Can ancestors use it? The shopkeeper gave him a white look and said, why should Jobs go on teaching himself? Why don't you go to a colleague and buy one, and the boss reminds you: buy a mobile phone case, which is quite humid below. Colleagues said yes. The boss went on to say: buy another Bluetooth headset or wired headset. Recently, new traffic regulations have been issued below, and driving and making phone calls are very strict. My colleague gave in again and bought another earphone. The boss continued to kindly remind me that the most important thing is to buy a charger. Don't forget to burn the charger. It's not good to go back to your ancestors. It's still a small matter to ask you for it. It's very troublesome to send. Colleagues were afraid that their ancestors would let him send them, so they had to buy another charger. When paying, my colleague asked the boss for a business card. My colleague said that I would burn it with the sacrifice to my ancestors. If there is something wrong with my mobile phone, I can directly ask you for warranty.