I follow this thread
https://www.mobileread.com/forums/showthread.php?t=60006
and replace the sim card in kindle 3G successful.
It can connect to the local 3G networt, and can connect to website in broswer. But when try to use the sim card to receive document. It will disconnect the 3g network first, and try to find Wifi instead.
Is there any way to make it use my sim card when there is no Wifi network?
