From high-speed wi-fi access to traditional postal services, London connects you to the world 

• Telephone dialling codes: the London area code prefix is 020. International callers to London will dial + 44, followed by the London number
• Telephone information services: the international operator can be contacted by dialling 155 from the UK. Other useful numbers include the domestic operator (100), domestic directory enquiries (118 500) and international directory assistance (118 505)
• Public telephones: public telephones are widespread in London, the majority run by British Telecom. The minimum call charge is 40 pence from a BT payphone. Mobile phone usage has led to a reduction in public phones in operation in the UK. Download London payphone locations
• Postal system: London’s post offices are open from Monday to Friday, 9.30am to 5.30pm. You can buy stamps from post offices, supermarkets and newsagents. First class deliveries should arrive the following day. Second class items should arrive within three days. Postal charges are based on a combination of size and weight
• Mobile voice, video and data: the UK mobile market is highly competitive and deregulated. Providers are fighting hard for customer share. Shop around to obtain the best deals 
• Internet access from home: domestic high-speed internet services are common in London and relatively simple to install. Wireless broadband services have fallen in price in recent years and various ‘bundled’ services — packaged TV channels, landline phone and broadband — are now available. Shop around for the best deals
• Public internet access: there are thousands of internet cafés in London, charging upwards of 50 pence an hour. You will also find internet kiosks on some high streets and in airports and railway stations. Many areas of London are now wireless (wi-fi) hotspots, allowing computer and mobile phone users with the correct software and hardware to log on.