Voice over IP, or Internet telephony, has been around since the 1990s, but the development of more powerful hardware codecs and now software codecs means that low-cost VoIP handsets are becoming standard issue in most offices. However, many of these handsets and their back-office systems have been left trailing in the last decade by developments in cloud computing, with telecoms following data storage and computing resources toward cloud environment adoption. It's now possible, for example, to host regular geographic UK numbers in the cloud, and then deliver inbound calls to the device of your choice this could be a regular landline, a mobile phone using 'conventional' GSM/3G cellular, or a mobile using VoIP technology delivered across 3G or Wi-Fi channel.