O2 4G calling: Expands to 16 cities in UK

O2 has enabled 4G Calling in four further cities taking the total list of cities to 16. They have updated their online coverage check to show these new locations

Countries that enable you to make 4G calls are;

1. Bristol
2. Belfast
3. Birmingham
4. Bradford
5. Coventry
6. Edinburgh
7. Glasgow
8. Leeds
9. Leicester
10. Liverpool
11. London
12. Manchester
13. Newcastle
14. Nottingham
15. Sheffield
16. Slough