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Select Committee on Science and Technology Third Report


SCIENTIFIC ADVISORY SYSTEM: MOBILE PHONES AND HEALTH

INTRODUCTION

Mobile Phones and How They Work

6. Mobile phones are low-power radio devices which transmit and receive radio frequency (RF) signals, which fall in the microwave region of the electromagnetic spectrum. In the UK these signals are typically around either 900 Megahertz (MHz) or 1800 MHz. Mobile phone systems are dependent on microwave communications between handsets and fixed transmitter base stations which operate at the same wavelength but higher power levels. Each base station covers a specific area, or 'cell'. As a person using a mobile phone moves from one cell to another the controlling network switches communications from one base station to the next.

The Mobile Phone Industry

7. There are several mobile phone manufacturers, many of them household names such as Motorola, Ericsson, Nokia and Sony, and a wide range of models is available. The phones are frequently sold as part of a package which includes connection to a network. There are four network operators in the UK and three system standards: Vodafone and BTCellnet operate systems based on the analogue Total Access Communications Standard (TACS) and the digital 900 MHz Global System Mobile (GSM) standard, and Orange and One-2-One operate systems based on the digital 1800 MHz GSM standard.

8. As the number of mobile phones in use increases, so network operators must build more base stations to manage the increase in call traffic. In rural areas, where there is a lower user density, base stations are typically two kilometres apart. In towns and cities where there are more users the cells are smaller and transmitter base stations can be as little as a few hundred metres apart.[3] There are now some 20,000 base stations in the UK, some of which are located on transmitter masts shared by more than one operator.

9. Technological change can occur rapidly in this sector. The introduction of digital GSM systems in the early 1990s brought improvements in communications quality and, unlike analogue systems, GSM phones automatically adjust the power output to the minimum required to maintain communications.[4] Next year the Government intends to auction licences to operate the third generation of mobile phones with a new standard: the Universal Mobile Telephony System (UMTS) for introduction in 2002.[5] TACS is due to be phased out by 2005.

Benefits

10. Mobile phones offer both social and economic benefits. The sheer size of the industry in the UK, which currently employs over 100,000 people and contributes around £5 billion to the UK's GDP, demonstrates its important contribution to the UK economy.[6] Motorola alone employs over 10,000 people in the UK, had UK sales of £3.3 billion in 1998 and is in the top ten UK exporters.[7] Vodafone, following its merger with Airtouch Communications, is now the second largest UK company in terms of its market capitalisation of around £70 billion, and has interests in 23 countries.[8] Recent growth in the mobile phone market has been dramatic. In 1998 the market grew by 54% and mobile phones were the most popular Christmas gift.[9] In the first quarter of 1999, the industry acquired almost 20,000 new customers each day.[10] Telecommunications is important as an industry sector in itself but is also part of an essential infrastructure upon which other businesses and services depend. Orange plc, for instance, pointed out that mobile phones are now important business tools which contribute to improved communications and productivity and that they are increasingly used for data as well as voice transmission.[11]

11. The most persuasive evidence that the public perceive a benefit from mobile phones is that so many choose to buy them and use them so frequently. It is estimated that there are now 16 million users in the UK, representing roughly 25% of the population.[12] The flexibility offered by mobile telephony, price convergence between mobile and standard networks and the introduction of UMTS, which will offer global coverage and a range of additional services, indicates that the market will continue to grow. It has been estimated that by 2000, 50% of all calls in the European Union (EU) could involve a mobile phone.[13]


3  Ev. p. 74. Back

4  Ev. p. 30. Back

5  Ev. p. 121. UMTS will operate in the 2 GHz band.  Back

6  Q. 108; Ev. p. 21. Back

7  Ev. p. 24. Back

8  Ev. p. 28. Back

9  Q.13. Back

10  Ev. p. 21. Back

11  Ev. p. 56. Back

12  Ev. p. 21. Back

13  ACTS Bulletin No. 11, p.1. Back


 
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© Parliamentary copyright 1999
Prepared 22 September 1999