Hi there! I see you're trying to update the Del Taco app on your older iPhone, but it requires iOS 18.0 or later, and your device is currently on iOS 16.7.11. That can definitely be tricky when the app needs a newer operating system than what your phone supports.

Can you tell me which model iPhone you have? Some older iPhones unfortunately can't upgrade beyond certain iOS versions, which means they can't run apps that require the latest updates.

Here’s what we can try:

1. Check your iPhone model and its max iOS version:
Go to Settings > General > About and look for the Model Name. Then, we can verify if it supports iOS 18.0 at all.

2. If your iPhone cannot update to iOS 18:
- Unfortunately, you won’t be able to install the latest Del Taco app version since it needs iOS 18 or higher.
- You might consider using Del Taco’s website for ordering or checking if they have an alternative method to use their service.
- Another option is to use a newer device if possible.

Let me know your iPhone model, and I can help confirm your options! Are you okay with trying that?