I'm not sure where this belongs on WebmasterWorld, if anywhere, as it's not exactly a webmaster-related issue.

On 13 June 2014 new consumer laws come into effect in every EU member state based on an EU Directive published in October 2011. If you're doing business in the EU these new laws will probably apply to you. There are many changes concerning various details that must be stated before sale and many changes to the return and refund rights for goods and services.

One important aspect concerns telephone lines offered for post-sale customer services. Any such line must henceforth use a "basic rate" telephone number.

In the UK that equates to a telephone number beginning 01, 02 or 03, and, from 26 June 2015, also telephone numbers beginning 080. Numbers which do not and will not comply begin 084, 087 and 09.

Ofcom has reserved matching 034 and 037 numbers for all users of existing 084 and 087 numbers to migrate. This process can often be completed in a matter of days. That's handy, because the new consumer law takes effect in just under three weeks time.

Some UK-specific information:
[legislation.gov.uk...]
[telephonenumbers.co.uk...]

The compliant prefixes vary from country to country, but the same "basic rate" principle applies right across the EU.

Some businesses have said they haven't been given enough warning. However, the EU Directive was first proposed in 2008, and finally published in October 2011. The UK Government held a lengthy consultation on the contents in mid-2012. The draft legislation was published in August 2013 and the final version in December 2013. The 03 numbers that most businesses appear to be using as the solution first became available in 2007.