Buy One to Get One Free--You buy the 7 days prepaid plan Hong Kong card then you get a sim card of 30 days prepaid plan for China mainland</br>3.5GB data and 127 mins international calls are applied in Hong Kong while 100 mins call and 1GB data are applied in China mainland</br>You could make international call when you in HKotherwiseyou would free to receive calls from the US when using the China sim card in China Mainland.</br>Simple use of the HK sim cardPlug and Play.But please assure your phone is applicable for China mainland sim card.</br>No registration needed for HK Sim card but please take note to get registration for the China Mainland sim card on official registration website via QR code or email us via Amazon message directly</br></br>Product Description</br></br><b>Buy one to get one for Free</b><br>You would get two triple cut sim cards one is 7 days prepaid plan for Hong Kong and the other is 30 days prepaid plan for China mainland.<br>Triple cut sim card design makes you away from sim card adapter. No registration needed for HK sim card3G/4G network simply plug and use! But please take note to get registration for the China Mainland sim card on official registration website via QR code or email us via Amazon message directly.<br><br>The order contains:<br>3.5GB high speed 4G data and 127 munities international calls are applied in Hong Kong while 100 minutes call and 1 GB 4G data are applied in China mainland<br><b>APPLICABLE DEVICE:</b>All unlocked smart phones are applicable for HK sim card but in China mainland?? please assure y