Bulk SMS can be an effective way to promote your charity’s impact stories and case studies. Here are the steps to follow:

1. Collect phone numbers: First, you need to collect the phone numbers of your donors and supporters. Make sure you have their permission to contact them via SMS.
2. Choose a bulk SMS service: There are several bulk SMS services available online. Choose one that fits your needs and budget.
3. Compose your message: Keep your message brief and to the point. Share a powerful impact story or case study about how your charity has made a difference in someone’s life. Use storytelling to create an emotional connection with your audience.
4. Personalize your message: Address your donors by their name in the message. This will make them feel more connected to your charity.
5. Include a call-to-action: Include a call-to-action in your message, such as “Learn more about how we are making a difference in people’s lives” or “Support our cause by sharing our impact stories with your friends and family.”
6. Provide details: Provide details about where they can find more impact stories or case studies, such as links to your website or social media pages.
7. Schedule your message: Choose a date and time when most of your donors and supporters are likely to be available to receive the message.
8. Send the message: Once you have composed and scheduled your message, send it to your donors and supporters.
9. Follow up: Follow up with donors and supporters who have engaged with your message. Thank them for their support and encourage them to share your impact stories with their network.
   Remember to respect your donors’ privacy and preferences. If they opt-out of receiving SMS messages, make sure you remove their phone number from your list. Also, avoid sending too many messages as it may lead to donors feeling overwhelmed and opting-out.