Sending messages

We have multiple ways to send someone a message these days.  If you want to contact someone, you can:

1. Call their landline

2. Call their cellphone

3. Text them

4. Email them

5. Mail them a note

6. Create a web page

7. Have an airplane pull a banner through the sky

8. Use any one of many social media

9. Have a friend or a grandchild use their know-how in any of the above ways

I like to know my friends' preferences for communication channels but I often don't.  Besides, preferences and arrangements can change without notice. So, I imagine a message sitting in an email account unread for days or longer.  There are pros and cons for each method.