Here are some tips to help you get started:

1. Build a targeted list: Create a list of phone numbers belonging to your volunteers, supporters, and potential volunteers. Segment your audience based on interests, skills, and availability to personalize your messaging.
2. Use a personal tone: Use a personal tone and language that connects with your audience. Address them by name and thank them for their interest in supporting your charity.
3. Provide details: Provide details of your upcoming events and activities, including the date, time, location, and purpose. Highlight the benefits of volunteering, such as the impact of their contributions on your charity’s mission.
4. Use clear and concise messaging: Keep your messages short and to the point. Use language that is easy to understand and avoid jargon or technical terms.
5. Include a call to action: Encourage your audience to take action by including a clear call to action, such as “Sign up to volunteer” or “Register for the event.”
6. Provide exclusive content: Give your volunteers and supporters access to exclusive content, such as early access to event tickets or a sneak peek of the event program.
7. Timing is key: Send your messages at a time when your volunteers and supporters are most likely to be receptive. Avoid sending messages during times of the day when they are likely to be busy.
8. Use a reliable SMS service provider: Choose a reliable SMS service provider to ensure that your messages are delivered promptly and efficiently.
   By following these tips, you can use bulk SMS marketing to engage volunteers and supporters for your charity’s events and activities, increase attendance and participation, and raise awareness of your mission.