How about PCCW Hong Kong Limited?

I work in PCCW. Generally speaking, going to Shanghai should belong to the category of customer service. PCCW also has a branch in Guangzhou, which is a big company. However, unless you work in a middle or high position, you will have a long time or outstanding promotion opportunities. If you are an ordinary employee, after working in PCCW, if you want to change companies in Shanghai, you can go to Nokia Customer Service Center. Generally speaking, you can learn something by entering a big company, but deep down, you have to be in a higher position to have a chance.