Need advice from Sri Lankan iPhone users!

I'm planning to buy a used or brand-new iPhone and I'm deciding between the iPhone 12, 13, 14, and 15.

I already know that the iPhone 13 has reportedly been restricted/banned for import in Sri Lanka, so I'm aware of that. I'm mainly looking for advice on the phones themselves.

If you've owned or used any of these models, could you share:

• The model you use.
• Pros and cons.
• Battery life.
• Camera performance.
• Any common issues (overheating, green screen, battery health, etc.).
• Whether you'd recommend it in 2026.
• Whether it's worth paying extra for the 14 or 15 over the 12.

I'd really appreciate any experiences or suggestions. Thanks in advance!