Three (3)
1. The price of Three's ZTE MF627 Pay As You Go (PAYG) Mobile Broadband USB Modem has been reduced to just £19.99. Naturally you'll need to top-up the modem with a data usage allowance (valid for 30 days from activation); these come in flavours of 1GB for £10, 3GB for £15 and 7GB for £25.

2. Interestingly Three (3) has also cut the price of its Ready to Go pack to £39.99, which bundles the same USB Modem above with 3GB of pay-as-you-go usage. On the surface this looks to be £5 more expensive than buying them separately, though one key difference is that the data allowance lasts for 3 months instead of 1. There's also a 15GB pack for £97.86 that lasts for 12 months.

3. The monthly 5GB Mobile Broadband service plan has also been reduced to £15 per month and £9.99 for the USB Modem.

O2

Customers signing up to one of O2's Pay As You Go (PAYG) Mobile Broadband packages before Monday 29th June will be able to get a USB Modem for half the usual price at just £14.67. Prices start from £2 for a 500MB (0.GB) usage allowance valid for 1 day + Unlimited Wi-Fi and go to £15 for 3GB + Unlimited Wi-Fi valid for 30 days (1 month).