Hefei Mobile 100M 1 year Hefei Mobile 100M 2 year Mobile 69 yuan monthly delivery of 100 megabytes of mobile broadband additional set-top box Hefei Telecom 50M 1 year Hefei Telecom 50M 1 year Hefei Telecom 50M 1 year Hefei Telecom 50M 1 year Hefei Telecom 50M 1 year Hefei Telecom 50M 1 year Hefei Telecom 50M 1 year Hefei Telecom 50M