Android phone is turned on, but sometimes I can't make a call. There are SMS notifications, and some can receive calls. How could this be

It depends on what brand of Android phone you are, because most mobile phone systems are Android except windows and IPHONE.

What's wrong with your mobile phone? It depends on what brand of mobile phone you are. As soon as I came up, it was an Android phone. Now all the knockoffs have Android installed. Not necessarily Android.

Hardware problems:

1. Maybe there is something wrong with your signal receiver, because the phone is instant messaging and the SMS is delayed communication. In other words, this call is sent to your mobile phone immediately via satellite and base station. At this time, if your receiver is not sensitive or has poor contact, your mobile phone will sometimes receive it, and sometimes it will not. The short message is forwarded by the mobile server.

You said you called, but you couldn't get it. But there is SMS notification, and you have SMS notification service.

This is similar to our landline. If we don't plug the phone line into the phone, the phone can come in and the signal comes, but there is no landline to answer it. In other words, the phone signal is coming, and your mobile phone can't receive it normally, so there is a short message reminder.

Solution:

Hardware problems can only be solved by mobile phone repair or after-sales service.

Software problems:

1. It is possible that the Android system itself and the hardware of the mobile phone itself are not well compatible, which leads to the incomplete activation of the instant call part.

2. It is also possible that the Android system of your mobile phone itself is in the call part, and the signal processing of the mobile phone is not good. If the Android system is not installed and optimized, it will affect the signal and call.

Solution:

1. Reinstall Android system or restore factory settings. If you can't restore the factory settings, please reinstall Android. I won't go into details about the specific installation methods, such as GFAN, XDA and Jifeng. Com and An Zhi. Com has very detailed tutorials. Teach you to do the system step by step.

2. You can also consider installing an optimized Android system. I installed the Xiaomi system, which is the MIUI system. I think it's quite useful. If you want to install Xiaomi system, there are installation methods for each different type of mobile phone directly in Xiaomi Forum.

Finally, it is suggested that:

Install the system first. If the system doesn't work after installation, you need to repair the hardware.

PS: Please feel free to ask me if there is anything you don't understand. But when I go to work, I usually can't come back in time. I'll give it back to you when I see it.