What mobile phone card in Beijing has a signal in the basement?

"I'm not an eyesore" is right. No matter what kind of mobile phone, there is no signal transmission point in the basement.

Now, no matter what mobile phone, even PHS has a signal in the elevator of a high-rise building, and the call quality is excellent because of the launch point.

Mobile has a mobile launch point, PHS has a PHS launch point, and Unicom has a Unicom launch point, but it will not be installed in the general community. You have to ask the property.

If there is nothing, you can only install a landline and set your mobile phone to get on the landline when there is no signal.