Telephone
The advantage of using the telephone to communicate with your friend is that it is a very reliable device and you can talk to your friend as if you were face to face with them, no matter how far you are. Unlike sending emails, or anything of that sort, using the telephone has the best response time. The disadvantage to using the telephone is that you might be a great distance away from your friend and the signal might get interrupted or might just drop and you cannot do anything about it.
Email
The advantage to email is that when you send the message to your friend you don't need to sit and wait for a response. The message is stored in a database and your friend can choose to read it whenever they wish. You can go do whatever you want and come back sometime later to check whether you have received a message. The disadvantages to using Email is that you must be connected to the internet to be able to send messages to your friend. If you do not have internet connection then you are unable to send a message.
Real-time teleconference
The advantage to real-time teleconference is similar to that of the telephone. You can directly speak to your friend. You can also add multiple people to your conference and speak with them. The disadvantage is that you can get disconnected from it and it may become hard for everyone to get setup again.
Fax
The advantages of using a fax machine is that you may send the documents straight to your friend if they also own one. The disadvantages of using fax is that your friend may not also own one so that way it might not work. Also, like the telephone, the fax machine goes through telephone service so that may get disrupted somehow.
Overnight mail service
The advantages of overnight mail service are simple. You and your friend may send messages back and forth overnight. The disadvantage is that it takes time to send messages back and forth so this is the least efficient method of them all.
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