Consumers have just a matter of hours to take advantage of TalkTalk's current BlackBerry Curve 9320 offer.
The online exclusive deal - which offers a free handset with a range of mobile tariffs - is being withdrawn today.
Subscribers can get their hands on a free BlackBerry Curve 9320 in a choice of three colours - black, teal blue and velvet purple.
TalkTalk says the device is "packed with easy-to-use features", such as the dedicated BBM key and Facebook and Twitter apps.
The entry-level Small tariff - ordinarily priced at £10 per month - offers 100 minutes, 250 texts, 200GB of data, and 100 minutes of calls to TalkTalk Mobiles.
At present, customers are able to pay just £2.50 per month for the first six months of their 24-month contract.
TalkTalk's £15 per month Medium plan - which offers 550 minutes, 3,000 texts, 1GB of data and 100 minutes to TalkTalk Mobiles - is currently reduced to £3.75 per month for the introductory period.
And the higher-tier £25 per month Large plan - which offers 1,250 minutes, 3,000 texts, 4GB of data and 100 minutes to call TalkTalk mobiles - is priced at just £6.25 for the first six months.
As part of their mobile deal, TalkTalk customers receive unlimited family calls, free text alerts, free voicemail services and free calls to customer care.