List 3 popular smartphone models
1. iPhone 12 by Apple
2. Samsung Galaxy S21 by Samsung
3. Google Pixel 5 by Google.
Complete the following task based on the instruction and optional input provided.### Instruction:
List 3 popular smartphone models

### Output:
1. iPhone 12 by Apple
2. Samsung Galaxy S21 by Samsung
3. Google Pixel 5 by Google.