O2 has launched new tariffs for its 4G mobile broadband service, which apply to dongle and tablet users.
Customers can now pay £15 per month for 3GB of data, or £25 per month for a heftier 5GB usage allowance.
Unused data - up to a maximum of 12GB - can be rolled over to add to the next month's allowance, in a bid to ensure customers get value for money.
O2 is also offering a data block of 5GB for a one-off price of £30. This can be used at any point over a 90-day period but cannot roll over.
The 4G tariffs can be used with a range of touch-screen tablets - including the Samsung Galaxy Tab 3 10.1 and the Sony Xperia Tablet Z.
Consumers seeking the 4G-enabled Samsung Galaxy Tab 3 10.1 must pay £399.99 up front, with the Wi-Fi-only version available for £299.99.
The 4G-enabled Sony Xperia Tablet Z costs £499.99, while the Wi-Fi-only model is priced at £399.99.
In terms of O2 4G dongles, consumers have two choices - a ZTE model priced at £50, or a Huawei make featuring mobile Wi-Fi, which costs £65.