Bulk SMS can be an effective way to promote your charity’s advocacy campaigns and social causes. Here are the steps to follow:

1. Collect phone numbers: First, you need to collect the phone numbers of your supporters who may be interested in promoting your charity’s advocacy campaigns and social causes. 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. Explain the issue your charity is advocating for and why it is important. Provide a clear call-to-action on how supporters can get involved in promoting the cause.
4. Personalize your message: Address your supporters 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 “Join our advocacy campaign by signing our petition” or “Spread awareness about this social cause by sharing our social media posts.”
6. Provide details: Provide details about the advocacy campaign or social cause, such as the goal of the campaign, how supporters can contribute, and how their contribution can make a difference.
7. Schedule your message: Choose a date and time when most of your 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 supporters.
9. Follow up: Follow up with supporters who have taken action. Thank them for their support and encourage them to continue to promote your charity’s advocacy campaigns and social causes.
   Remember to respect your supporters’ 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 supporters feeling overwhelmed and opting-out.