I assume you are talking about Bluetooth Mesh. To be able to connect to the same node with a different phone, you need to add the same network key to the other phone. Also assuming that you are using our nRF Mesh app, you can do this by going to Settings -> Network Keys, and add the network key.
Are you using one of our examples? Note that you have to have the proxy feature enabled in your application for this to work. Also, currently our example supports only one proxy connection, so you won't be able to connect both phones at the same time.
