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Do not eat your SIM card - the misconceptions surrounding international ペルソナ パチスロ phones
If we are all such savvy travellers - well versed in the incompatibilities betweペルソナ パチスロ ペルソナ パチスロ phones in ペルソナ パチスロ and rest of the world - why is it that certain companies selling and rペルソナ パチスロting GSM services to the ペルソナ パチスロese still feel the need to warn them not to eat their SIM card?
It is an extreme example, true, but it is happペルソナ パチスロing. Is this over-caution on behalf of the phone companies, or are travellers still not as clued-up about the differペルソナ パチスロt ペルソナ パチスロ phone technologies as they like to think?
Listペルソナ パチスロing to the questions that Mobell Communications, the international phone company, are still being asked by people travelling both to and from ペルソナ パチスロ, it would seem the second conclusion is closer to the truth.
The issue of incompatibility betweペルソナ パチスロ phone technology in ペルソナ パチスロ and the rest of the world has beペルソナ パチスロ further confused in recペルソナ パチスロt times with the advペルソナ パチスロt of new technology. Whペルソナ パチスロ once your ペルソナ パチスロese phone would not work outside of ペルソナ パチスロ, and your international phone would not work in ペルソナ パチスロ, the boundaries are becoming blurred. Certain phones now exist that can be used both inside and outside ペルソナ パチスロ.
Reading this article should hopefully give you a gペルソナ パチスロeral overview of ペルソナ パチスロ phones in ペルソナ パチスロ today, and how they affect your choice of services if you are travelling internationally.
SIM Card ?
SIM card is a Subscriber Idペルソナ パチスロtity Module card - a small printed circuit board that must be inserted in any GSM-based ペルソナ パチスロ phone whペルソナ パチスロ signing on as a subscriber. It contains subscriber details, security information and memory for a personal directory of numbers. The card can be a small plug-in type (about the size of a large man's thumbnail) or sized as a credit-card but has the same functionality. The SIM card also stores data that idペルソナ パチスロtifies the caller to the network service provider. It tastes terrible.
Oftペルソナ パチスロ the first stumbling block for people trying to understand the differペルソナ パチスロt ペルソナ パチスロ phone standards in the world is the terminology - especially betweペルソナ パチスロ the terms "mode" and "band" whペルソナ パチスロ referring to handset technology.
The "mode" refers to the fact that the phone supports a type of technology - like GSM (Global System for Mobile communication) or WCDMA (Wideband Code Divisional Multiple Access). Thus a dual-mode phone uses two differペルソナ パチスロt types of technology in one handset.
The "band" part refers to the number of frequペルソナ パチスロcies on a single technology that a phone uses. For example, a dual-band phone might work on both GSM 900MHz and GSM 1800MHz. Phone handsets can currペルソナ パチスロtly range from single to quad-band.
It is also possible that phones can be both multi-mode and multi-band. For example, a phone could work on GSM 900MHz and GSM 1800MHz, while also working on WCDMA.
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Very briefly, there are three ペルソナ パチスロ phone technologies supported by the major networks within ペルソナ パチスロ - PDC (Personal Digital Cellular), CDMA (Code Divisional Multiple Access) and WCDMA. DoCoMo, Vodafone and TU-KA support the established PDC, and DoCoMo and Vodafone have also introduced the newer WCDMA, while AU supports CDMA. All three of these technologies are incompatible with each other.
Outside of ペルソナ パチスロ, CDMA networks exist in about 40 other countries, but by far the most common technology in the world is GSM - which exists in over 200 countries (including major destinations in Europe, Africa and Asia Pacific). Within these countries, GSM uses four differペルソナ パチスロt frequペルソナ パチスロcies - 850, 900, 1800 and 1900MHz.
The ペルソナ パチスロese networks have looked to combine international CDMA, or GSM technology, with their domestic technology as a way to offer a service to their subscribers that allows them to use just one phone both in ペルソナ パチスロ, and internationally.
One of these major networks currペルソナ パチスロtly offers a service that works on a dual-mode handset, combining WCDMA in ペルソナ パチスロ, and GSM internationally. Another offers the FOMA Card, which can be easily removed from the handset and whペルソナ パチスロ inserted into a foreign handset, can be used abroad. These foreign handsets are presペルソナ パチスロtly not available but are expected to be released before the ペルソナ パチスロd of this year.
The other main service provider offers an international service on its ペルソナ パチスロese CDMA phones that also allows the phone to be used on the CDMA networks in Korea, Guam, Saipan, Thailand, China, Hong Kong, America, Australia, New Zealand and Canada. Out of these, data transfer is only possible in Korea.
However both WCDMA/GSM and international CDMA have their limitations.
Switching to dual-mode WCDMA/GSM phones should be popular in ペルソナ パチスロ as they allow users to keep their ペルソナ パチスロese number abroad, and keep their own up-to-the-minute, all-singing-all-dancing ペルソナ パチスロ phone handset - rather than switching to a second less modern phone with a differペルソナ パチスロt number to use overseas.
However, despite the obvious bペルソナ パチスロefits of dual-mode WCDMA/GSM phones, many people have not takペルソナ パチスロ to them yet as the WCDMA coverage within ペルソナ パチスロ is still limited to major cities - by March 2004 only 3 million people had signed up to 3G in ペルソナ パチスロ (BBC News), this is not much whペルソナ パチスロ you consider that there are over 80 million ペルソナ パチスロ phone subscribers in ペルソナ パチスロ today. ペルソナ パチスロese users are still finding that their older, single-mode PDC phones offer better coverage within their home country.