The relationship between 9900 and 9930 is that the appearance and hardware configuration are exactly the same, except that 9930 supports more than one telecom CDMA2000 network, and the number must be burned when accessing the network, and uim cards cannot be inserted directly. If the sim card is mobile/Unicom GSM or Unicom WCDMA, it can be inserted directly.

In fact, 9850 and 9860 are also related to this. It is not a series with the original 9800 and 98 10 slider at all. They should be an upgraded version of the 95XX series. As can be seen from the name, 9850 and 9860 are the third generation Strom.

Because 9860 and 9850 support different networks, foreign operators are different. The 9850 only has Sprint operation, so the ROM will be different. Of course, you can brush it, but it makes no sense.