If you have been thinking about buying a Lumia 640 or Lumia 735, you might want to make a decision quickly. Microsoft's offer to give buyers of either phone in the US a free one year subscription to Office 365 Personal ends today, July 31.

The subscription normally costs $69.99 a year and allows users to have full access to Microsoft's Office apps on one PC and one smartphone or tablet, along with 1 TB of OneDrive storage and 60 minutes of free Skype calls a month.

The 5-inch Lumia 640 is available from AT&T, T-Mobile and MetroPCS, but the 4.7-inch Lumia 735 is an exclusive for Verizon Wireless in the US.

Check out the Lumia 640 from AT&T at the Microsoft Store ($79)

Check out the Lumia 640 from T-Mobile at the Microsoft Store ($129)

Check out the Lumia 735 from Verizon at the Microsoft Store ($199 without a contract, $49 with two year contract)

Source: Microsoft