Ours is D-link in my house, but i dunno what we are using in the office, both weak wifi signal
Then the Sony Call Center called me twice,
1st they offer me to replace my model from Xperia SP to Xperia V...Stupid! Who wants to exchange for a downgrade!
2nd, they call me back again and they offer to replace it by Xperia Z, but need to top up SGD200, although good deal but i preffer to REFUND!
If you want to change to Xperia Z, just do also compalain, they will offer you something, just follow what i did lol, but i prefer to refund.