Apple has contributed to fixing a problem with using the iPhone 4S on China Mobile, the People's Daily reports. Some 4S owners have been having trouble activating SIM cards, or else simply making calls with a full signal. A telecom expert reached by the Daily notes that the issue appears to involve the 4S only supporting the GSM P band -- 885-915MHz -- and not the E band (880-890MHz), although both are used by China Mobile.
