Settop board of EFCONTROLS CO., LTD. is well operated on CHINA MOBILE(中國移動) sim card in china.
 
The settop board receives sms data generated from smart phone and transmittes a result alarm in the method of sms.
 
This shows at GP CHINA 2019 held at Crowne Plaza Beijing Sun Palace in china at 22th May, 2019.
 
https://www.youtube.com/watch?v=hQWuKVfBn20