I want to know about how many phones can one beacon connect with
Phones connect to beacons only when you need to modify the settings or check some sensor data. There can be only one phone connected to a particular at the time.
If you’re asking, however, about typical use cases such as displaying notifications or automating things, in order to prompt them, there’s no need to establish a connection. Phones listen to the nearby beacons and once they detect a specific device in range, they can perform various actions. Because of that, thousands of devices can simultaneously listen to the same beacon and prompt actions programmed in the apps. There’s literally no limit.