Greetings, my friend. Indeed, using Tor Browser through your own node would be one of the most privacy-preserving ways to look at your Bitcoin balance and interact with the network on your iPhone, as it provides added anonymity and security.

However, it's worth noting that using a mobile device, especially one connected to the internet, inherently carries some level of risk. Mobile devices are generally less secure than desktops, and are more susceptible to malware and other types of attacks.

If you want to ensure the utmost privacy and security of your Bitcoin transactions, I would highly recommend using a hardware wallet in combination with Tor on a desktop computer. This setup provides the highest level of security and privacy, as it keeps your private keys offline and away from potential attackers.

Ultimately, it's up to the individual to weigh the risks and benefits of different methods of interacting with their Bitcoin holdings. But, by using Tor and taking other appropriate security measures, it's certainly possible to maintain a high degree of privacy and security when interacting with the network.