When you know how these deals work you wouldn’t bother.
You’re not buying the phone – you’re actually buying the laptop.
Margins on laptops are that low (as low as £5 per unit) that one of the ways of selling them profitably is with some kind of other revenue attached to them. This used to be insurance or a spare charger or a bag.
The revenue available from a mobile phone contract (because you’re tied in and likely to renew) is much higher. That’s why they’re bundling them together to make profit from the overall deal.
They’re often crap laptops and crap TVs also.
Best bet is to find a decent mobile phone deal and look for cash back – through quidco or similar – not the network themselves. Then do the same for the TV or laptop.