SIM card/ wifi egg problems in china
 

Normally I am using the telecommunications company plan when I back mainland for stay about 2-3 days, even though the fees not too expensive but I still feel that is a bit like "I pay more than what I should got". The internet Date will only be very smooth when 3:00-5:00AM that's is kind of stupid! As most conservative estimates I do really think the plan from telecommunications company but seems I have made a wrong decision! Do wifi egg really works well in mainland? Which is the best brand?

Sorry and thank you so much buddies :p