Three Upgrades - better to phone than do online?

I'm a couple of months past my contract expiration so I'm looking at the upgrade section of the My3 Account thing.

The deals l have on mine are rubbish! Way worse than what I have now.

What I was intending to do was keep my tariff, get the best phone possible. However it looks like I can't simply keep my existing tariff and upgrade the phone.

If I phone them will I be able to negotiate something better than what is showing online?