It will aim to entice relatives of customers who sign up to its mobile service with cheaper handsets and tariffs as low as £5 a month.
In a decision likely to spark a fierce price war, it is pinning its strategy on the fact that a significant volume of mobile voice and data calls are between spouses or parents and their children.
BT is expected to reveal full details of its mobile proposition by early next week. It will support the launch with a £30m advertising campaign by Abbott Mead Vickers BBDO in the autumn.
The telecoms company left the mobile telephony arena two years ago with the disposal of BT Cellnet, now branded O2.
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