Integrate Bulk SMS API in php code to send SMS in India. Visit https://teleoe.com for sms account signup and more help. ( Powered by AXTES™ - Accelerated Technology Solutions. https://Axtes.com )
References:
For Curl space error (503), Check these examples:
https://stackoverflow.com/questions/39910508/how-to-add-space-between-text-in-sms-in-php
https://stackoverflow.com/questions/6603928/should-i-url-encode-post-data/10002620#10002620