Unable send sms to mobile Zain in Saudi Arabia

Msgs sent from the device inReach to mobiles under the provider Zain are not received .

It works properly with STC.

I have informed your support Team and they replied To me telling to contact the provider Zain!

Frankly speaking I assume Zain Customer Care will not understand my problem.

if you need any support from my side to get deep into the problem let me know.