April 2015
98
9
Calls and contacts
9.1 Why does my phone have a signal, but I can't make
calls?
1. Please check whether your SIM card has been cut by hand to fit your phone. Sometimes cut
SIM cards cause problems when making calls. It is recommended that you go to an authorized
service center and get a standard nano-SIM card.
2. Try going to a different location and trying to make calls again. You can also ask colleagues
or friends nearby who use the same carrier as you to check whether their phones are also
unable to make calls so that you know if the mobile network is causing the problem.
3. Try updating your phone's operating system to the latest version.
4. If you have a 4G card, or if the 3G/4G network is always unstable, you can try using the 2G
network (
Settings
>
More
>
Cellular network
>
Preferred network type
>
2G
) to make
sure your phone's caller and callee functionality is working normally.
9.2 What do I do if I hear static or sounds like "zzzzz" from
electrical interference when I make calls?
1.
When the problem appears, if the sounds are choppy and interrupted, it is probably
electrical interference. Solve this in the following ways:
−
For network problems, this relates to the strength or weakness of your mobile
network signal. Try moving to a location with a stronger signal and making a call.
−
First, turn off the 4G network switch and try again to see if there is any improvement.
If so, this may indicate that the present 4G network is a newly established network
and is still unstable.
2.
When the problem appears, if there is a loud "zzzz" sound in the receiver, then the
problem doesn't relate to the network environment. It may be caused by the following
reasons:
−
Some people's voices are comparatively loud and some people's ears are especially
sensitive to loud frequencies. When calling this sort of person, some people may hear
a slight "zzzz". This sound will be even more apparent to people whose ears are
comparatively sensitive.