Privacy
If you don't know it yet, you probably don't know it.
Privacy is like a bubble. Once it’s gone, it’s really gone. There’s no going back.
The context
A mobile phone is not a calling device anymore. People need to understand this as a fact.
Calling unnecessary after several times is not a good choice. Still, people can do it, and it's their freedom. But, times have changed. Think about it.
If someone didn't attend or called back after a specific time (say one day), they either are busy with their life or don't want to be disturbed or forgotten.
What can you do?
Send a text message. It's simple as that! You'll get a response back if you try this way. The logic behind this behavior is to avoid awkward situations and conversations. It will work.
Why disturb someone?
Everybody is busy with their life, or nobody is that busy with anything. It's just a priority. People neglect or avoid other people, including you and me. It's just the way the world works.
Never send a hurtful message to anyone.
People go through different stages of life every day, and we don't know what the other person is facing now. It might be a dangerous situation, maybe grieving, maybe a happy moment which is about to collapse after seeing your hurtful message. Of course, some cases in which we lose our minds or act out of alcohol. But please be careful. You don't want to be the last person who did that to them.
I'm sorry
I'm sorry that it had to end this way. I don't want to face an awkward situation. I wish you all the best, and may the force be with you.
Peace.