I recommend Online SMS gateway. It is an interface for sending SMS messages without using a mobile phone. Think of the SMS gateway as a colossal computer with connections to hundreds of mobile networks across the globe. Yes, some mobile operators allow users to send text messages via their websites for free, but if you want to send SMS to multiple recipients simultaneously, this is not a viable option. To meet such a demand, commercial SMS gateways were invented. The BSG SMS gateway serves as a bridge between the web and the world of text messaging that provides you with a hassle-free solution for sending unlimited bulk text messages. The most reliable is https://bsg.world/ It is a global SMS gateway provider that facilitates bulk text messaging in the most cost-effective way. It supports over 1100 providers in over 230 countries