Vodafone India — can not send sms. imessage work fine

Address:

Mumbai City, Maharashtra, 400093

Its been a persisting issue since i am on a new iphone8. Imessage works, sms give message send failure.
I also have iphone 5c and 6s. Sms work fine on them.
For the record, i have called your customer support twice. They promised call back, i even got a call (Where your rep was trying to help with coverage when the problem is message center setting). Your support sucks.
Please assist.
Viren
[protected]
Mumbai