Yes, what you have to do is take the number to a China mobile store. Ask for the super secret service T2. They will ask for payment. DON'T offer money. You are to give a magical item such as a panda's paw or the tears of a noble ox. Some of your Agarwood should do the trick if you put some holy water on it first. After payment you must go to the highest building in the city and a helicopter will arrive and take you to the address. Hope that helps. Remember service T2.

You can use Baidu to search for a telephone number and there will be several sites that offer you such information as: Province, city, area and carrier (which are in Chinese).

Other information may include an address if it is a registered business and whether or not the number is used for advertising and/or spam.

If you're looking to stalk someone simply based on their mobile number alone, then you must use Lord_hanson's sagacious advice.

@ OP failing the above advice you could try getting a girlfriend and start humping.

The only sure-fire way that I know to do this is to paint yourself in chicken blood and dance around a fire made from arhgetfuckedwood naked while 7 virgins sacrifice a pure white bull inside a pentagram.

Why does the word stalker come to mind ?

Yeah, you can call them and ask them their address.

Allow me to translate the OP's question:

"I saw a foreigner having lunch and sat down with him, uninvited. Because I have no social graces, I kept talking despite him obviously resenting the intrusion. He made an excuse and left, so I followed him. He eventually told me his phone number in order to get me to leave. I call him at random hours but he doesn't answer. So I need to find out where he lives and go to his apartment."