Free BT line installation
Until 30 September, you can get free BT line installation; this is a massive saving as usually it would set you back £122.50. This applies to new lines, reconnections or even having second lines fitted and isn't dependant on already having a master socket.
However, it involves signing up for an 18 month contract, rather than the usual 12, and you'll need to make at least ten calls per month but these can be inclusive calls if you get a BT package. Either way though, the installation cost should dwarf any call costs.
How to get the deal
This isn't available online; to get it you need to ring 0800 800 150, lines are open Monday to Friday 8am to 9pm, Saturday 8am to 8pm, Sunday 9am to 6pm. When you call, ask for the 'New line free connection offer'.
When BT ran a previous similar offer, there were some reports of people having difficulty getting the deal. BT has assured us the call centre is well briefed so there should be no problems this time.
You won't have to pay anything up front, it'll simply appear on your bill as a charge then a credit. If you do try and cancel your agreement before the 18 months is up, you'll have to pay the remainder of the contract.
Slash call costs
You'll automatically get free weekend calls with BT's basic 'Unlimited Weekend Plan', which as the name suggests gives you inclusive weekend calls, without any additional fee. To do this you need to commit to a 18 month contract at the usual line rental cost of £11.25. Do ensure you sign up to paperless billing and pay by direct debit otherwise line rental shoots up to £14. While usually the evening and weekend package is also free, you won't get it with the free line installation offer.
You won't be able to get this offer if you're still in term with any other residential offers.