Is snapchat available in Guangzhou or Instagram ?

Hello, you can go to the serice office of China Mobile or China Telecom to ask them to open the internet and WIFI service for you. You may need to open an account and pay some. But if you are invited there, ask the invitor to handle this for you. It would be much easier for them.

I am not sure whether snapchat is available. But when I was in Guangzhou, I talked to my family with Wechat, which can be the most useful APP in China.