What does Apple's "icould" mean? If a friend uses iPhone 6, and I also use iPhone 6, and we are separated by a wall, how do I send him a message?

icloud means cloud storage. After turning on iCloud, your account can be used on different iPhones to synchronize contacts, text messages, photos, etc. As for iMessage, as long as both parties have turned on this function in the settings, they can use iMessage to send text messages to each other. iMessage will recognize the mobile phone number, so it can be sent directly to the other party's number.

I hope it will be adopted if it is good