Hi dear,
This is kara from chinaskyline.
Now I am selling SMS Modem, which can send bulk sms, support AT command, we will provide sms caster and USB driver.
SMS Modem 1/8/16/32/64 ports available.(2G/3G/4G)
https://www.alibaba.com/product-detail/WCDMA-3G-SMS-Bulk-32-ports_60800529624.html?spm=a2747.manage.0.0.4bf771d2arTwl2
if you are interested, please contact me now!
Skype:skyline.kara
WhatsApp/wechat: +86 18211260112
