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1. There is no signal or the signal is relatively poor, mainly because the signal will be affected by various factors such as terrain, landform, and high-rise buildings in the process of propagation, such as the current location is in a relatively closed place, and the signal may be affected.
2. If the mobile phone signal of other China Unicom users is normal, the following methods can be used to troubleshoot:
Method 1] Turn on airplane mode, then turn off or restart your phone and try again.
Method 2] Test of changing the phone card to change the mobile phone card to the mobile phone of a family member or friend and try again.
Feedback, we will check and deal with it as soon as possible.
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First of all, you can try to figure it out on your own, by going to Settings - General - Cellular - Off for a while and then on. [01B, T24th Floor, Silver Stone Plaza, Chunxi Road, Jinjiang District, Chengdu] or force restart to try it, it may be to enter the headphone mode, just adjust it. You can also try it by setting up - general - restore - restore system.
Otherwise, upgrade the phone to the system, and some minor software problems may be fixed after the upgrade. Trying these methods might work.
It can be due to improper settings that cause the handset to be silent. You can open your phone's "Program List" and click on the "Settings" option to enter. Then open the "Sound" option, uncheck "Silent Mode", and click on the "Volume" drop-down list.
In the "Volume" window that opens, turn the "**" sound up a little higher and click the "OK" button.
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There is no signal on the phone, you can see what caused it and fix it by the following methods:
1. Check whether the SIM card is inserted into the mobile phone: you need to insert the SIM card to connect to the signal.
2. Check whether the mobile phone card slot or SIM card is damaged: you can insert other mobile phone cards to try, and then put the SIM card of the mobile phone itself on other mobile phones to see if there is a signal, if the card slot is damaged, it is recommended to replace the card slot, if the SIM card is damaged, please go to the business hall to replace the SIM card.
3. There is no service on the mobile phone caused by network delay.
4. If the signal in the place is not good, the signal cannot be found, so you can search in another place.
5. There is no card or the card is damaged.
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Restart the phone once to see if there is a signal, restart method: press and hold the power button and the home button at the same time, and press until an Apple logo appears and then let go.
2.Try reinserting your card, or try a different card.
3.Enter the settings General Model Model ** has the information of the mobile phone, if the last two words are ll, the mobile phone is the American version, it may be a locked machine, then it can't be used, it needs to be unlocked.
4. If the letter is zp or ch, it may be a telecom machine, try a telecom card, if not, go to Unicom or mobile to buy a card.
It is recommended to bring the equipment to Room 01, 24th Floor, Silverstone Plaza, No. 99, Section 3, Hongxing Road, Jinjiang District, Chengdu for inspection and maintenance.
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If you are far away from the base station and there is no signal, the phone is useless.
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It's normal to have no signal, and it's the same with Apple phones.
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Whether there is no signal as soon as you get there, or there is a signal when you go back, it may be that the signal is usual.
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