It can be difficult to tell which numbers are which when it comes to phones, so let’s briefly make the distinction between 0844 numbers purchased for business and other numbers. 0844 numbers are generally used to call organisations, and there are two types of charges associated with calling 0844 numbers.
Firstly, there is the access charge, which is the price you must pay on a per-minute basis to your provider. In this case for Vodafone, calling an 0844 number can be expected to cost around 0.55 pence every minute. Note that Vodafone will charge you for, at the very least, one minute’s worth of call time.
Secondly, there is a service charge involved with making your call. This charge does not depend on Vodafone, but rather the company that you are attempting to contact. According to the Ofcom website, information regarding the service charge should be readily available from the company that you are attempting to contact.