The combination of charger and phone may not be able to communicate so no, you can’t just use any. For example Older iPhones will not be able to take an iPad charger. Check before you use. Having said that a lot of chargers and phones in recent years are more tolerant. There’s an optimal charging watts/voltage for each device. If you’re not sure, less watts is better so you don’t damage it. It’ll be slower but safer. A lot of smartphones are very similar now though, and are tolerant of the supply - usually 0.5A/2.5W/5V I believe