Hello,
I’m also same situation, i got some links for install the this modem and it’s worked from me… hope it will help for you…
http://www.samgalope.com/2016/09/03/build-centos-7-sms-gateway-gammu/
Cent7
http://www.samgalope.com/2016/09/02/centos-7-quickfixes/#home
Thanks
geeth