EE, the UK's largest mobile operator, and so far the only one to boast 4G LTE services, has begun offering SIM-only 4G plans. Prices start at £21 per month for a 500MB allowance, going up to £36 for a 5GB data bucket. All contracts run for 12 months, and include unlimited calls and texts. EE's SIM-only prices are substantially more affordable than its 24-month, phone-inclusive deals, though obviously you'll have to swallow the extra cost of picking up an LTE-capable phone off-contract.
Today's launch follows a brief delay in the roll-out of EE's SIM-only plans, apparently due to additional network testing requirements.