Could someone answer why in about on my 8x the os version shows as 8.0.10501.127 and have just updated my sons 520 and it shows 8.0.10517.150. Surely the os should be the same on both regardless to the additions that Nokia put on there? The reason i say this as i have noticed on my sons 520 at the top of the wifi icon there is a little arrow pointing away from the phone!!!