Bulk SMS can be an effective way to encourage corporate giving and partnerships for your charity. Here are the steps to follow:

1. Collect phone numbers: First, you need to collect the phone numbers of potential corporate partners who have shown an interest in your charity. 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. Highlight the benefits of corporate giving and partnerships, such as increased brand recognition, employee engagement, and social responsibility. Provide clear instructions on how corporate partners can get involved with your charity.
4. Personalize your message: Address your potential corporate partners 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 “Partner with us to make a greater impact” or “Learn more about our corporate giving opportunities.”
6. Schedule your message: Choose a date and time when most of your potential corporate partners are likely to be available to receive the message.
7. Send the message: Once you have composed and scheduled your message, send it to your potential corporate partners.
8. Follow up: Follow up with potential corporate partners who have expressed interest in partnering with your charity. Provide more information about the benefits of corporate giving and partnerships and answer any questions they may have.
   Remember to respect the privacy and preferences of potential corporate partners. 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 potential partners feeling overwhelmed and opting-out.