If you can't contact the phone number of the fund, you can try the following methods:

1. Find contact information on One Foundation official website or social media. This information usually provides other contact information, such as email or online chat service.

2. Try to contact a foundation at another time or on a working day. They may be dealing with other affairs, or the time they try is not their working hours.

3. If you still can't contact One Foundation after trying the above methods, you can consider sending an email or message through One Foundation official website or social media channels to ask if you can help.