Why does cell phone text messaging fail?

There are many reasons for sending failure. Now there is news on the mobile phone. It took more than 10 minutes to show the reason why the other party's mobile phone was turned off or there was no signal. Only when the other party receives the message will yours show the delivery! If the other party stops, yours will show that sending failed!

The maximum number of words in a short message is 70 words. If the other party sends more than 70 words, his mobile phone will be developed separately, but yours will be received together in the same short message!