If you only need to send occasional messages, don’t run a gateway at all. Use:
Their free tiers (e.g., Twilio gives $15 credit) often cover small projects for months.
Ozeki offers a free version of their SMS Gateway with:
For testing, development, or low-volume internal alerts, this is perfectly sufficient. No crack required.
Real-world analysis of warez “cracks” for messaging software shows they often copy email addresses, API keys, and SMS credits to remote servers. You could unknowingly pay for messages sent by a hacker.