0345 / 0333 numbers

Plenty of organisations choose 03 numbers, from large corporates and local authorities to small startups that want to look nationwide. The number rings on whatever device you set, mobile, landline, desk phone or app.

03 numbers were introduced by Ofcom in 2007 as an alternative to chargeable 08 numbers. They let organisations have a single national point of contact without consumers paying extra. Calls cost no more than a national-rate call to an 01 or 02 number and count toward any inclusive minutes the same way.

0300 numbers are easy to recognise and cheap to call. Calls cost the same as a call to a standard 01 or 02 number, and most landline and mobile providers include them in their inclusive bundles.

No more than a national-rate call to an 01 / 02 number, and counted toward inclusive minutes the same way. This applies from every kind of line. You can buy an 03 number from Smart Numbers starting at 99p a month.

No. 0330 numbers are a low-cost / often-free alternative to premium prefixes. Calling them costs the same as calling any other landline. Many fixed-line and mobile networks include 0330 in their bundles.

0345 is a non-geographic prefix often used by companies that offer a UK-wide service. It's included free in most monthly landline and mobile tariffs (not guaranteed, check yours). If you're moving from a legacy 0845 number, 0345 is the easy modern equivalent.

Most monthly mobile tariffs include 0345 calls. If yours doesn't, the call costs no more than a national-rate call to an 01 / 02 number and counts toward inclusive minutes the same way.

0345 is increasingly popular as an alternative to 0800 numbers (which carry a mobile-access surcharge). It signals you trade nationwide, with no geographic association, perfect if your customer base is spread across the UK.