4G speeds no longer command the premium they once did. O2 has just tweaked its SIM-only 4G plans, which now start at an affordable £11 a month for 500MB of data, 500 minutes and unlimited texts on one year contracts. Looking for more data? Set aside £20 a month for 3GB, £25 for 6GB or £30 for 8GB.
If you'd rather the flexibility of 30-day rolling plans, £15 a month gets you 500MB data, 500 minutes and unlimited texts. [O2]