To provide the quantity of smartphones in the cities mentioned, I would need to access the latest detailed reports from sources like the Pakistan Telecommunication Authority (PTA) or other relevant studies. However, I can provide a general estimate based on population and market trends. Here’s a rough estimate:

1. **Karachi**: ~15-20 million smartphones
2. **Lahore**: ~10-12 million smartphones
3. **Islamabad/Rawalpindi**: ~5-6 million smartphones
4. **Faisalabad**: ~3-4 million smartphones
5. **Peshawar**: ~2.5-3 million smartphones
6. **Gujranwala**: ~2-3 million smartphones
7. **Multan**: ~2-3 million smartphones
8. **Sialkot**: ~1.5-2 million smartphones
9. **Quetta**: ~1-1.5 million smartphones
10. **Hyderabad**: ~1.5-2 million smartphones

These figures are broad estimates based on city populations and average smartphone penetration rates in Pakistan, typically ranging between 50-70% in urban areas. For precise numbers, checking the latest telecom industry reports or surveys would be necessary.