Data roaming notification

今天试用了一个国外的SIM卡，装上后发现：

有一个 'Data roaming' 的nofication

you have lost data connectivity because you left your home network with data roaming turned off.

上网一查，发现原来跟网络设置有关

Mobile network settings -----> Data roaming （open）

参考：

http://androidforums.com/orange-san-francisco-zte-blade/281893-you-have-lost-data-connectivity-because-you-left-your-home-network-data-roaming-turned-off.html