What is the reason why the SMS does not show that it has been delivered?

Demonstration model: Iphone 12 System version: iOS 14.4 1. The SMS receiving time set by the other party's mobile phone is valid for 1 day. If the other party's mobile phone is turned off or out of service area, there is no signal during this period, and no message will be received.

2. The network transmission failed, and your mobile phone has no receipt report, so you can't see whether the short message was sent successfully.

Tips for using Apple's mobile phone:

1, Calculator Magic: Computers in iPhone are usually used for some simple addition, subtraction, multiplication and division operations. As long as you turn the computer sideways, you can start the scientific calculator, and some complex operations such as equations and root numbers can also be completed here.

2. Quickly take photos and record videos: When taking photos and recording videos, you often miss the beautiful moment because you need to turn on your mobile phone and then turn on your camera to shoot. In fact, you may not know that there are shortcut keys for taking photos and recording videos. This shortcut key is an ordinary volume key. If it is set in the camera settings in advance, you can use the volume button to control taking pictures and videos.

3, voice memo noise reduction: iPhone users know that voice memos are very easy to use, but sometimes if the environment is noisy, the recorded audio can not be heard clearly. In fact, as long as you click the magic wand icon of the audio file, you can reduce noise with one click, and the audio is much clearer.

4. Audio (voice) is converted into text: The audio files in the voice memo mentioned above can reduce noise. Here, let's talk about the arrangement of audio files. Because of work needs, I often record meeting minutes and inspiration, record some audio and then take notes slowly to avoid mistakes. In fact, I can use the audio-to-text assistant to organize audio files with just one click.