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Wireless Hydrophones |
Coverage Areas |
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WIRELESS DolphinEAR:
From $730 for the 'Application' System
WIRELESS COVERAGE
- 147 Countries! TYPES OF SERVICE ACCOUNTS: Mobile service providers offer various forms of service accounts. These generally break down into two categories: Pre-Paid, and Billed accounts. GSM mobile telephones use a SIM card (Subscriber Identification Module) that controls the type of billing account and the telephone number of the handheld telephone. Changing the card changes the details of the way the phone works. That makes the handset just a piece of hardware into which you load software (the SIM card). When you first set up your DE500 system you will need to activate your mobile phone by signing up with the local mobile telephone service provider. They will supply the appropriate SIM card which you insert into the GSM phone that is connected to your DE500. By loading a prepaid SIM card into the GSM phone, you can receive all incoming calls and are able to make outgoing calls up to the limit of your prepaid card. These cards usually do not work outside the country in which they are purchased. But, they do allow for quick and easy connections without waiting for your 'billed' account details to be processed. Check with individual service providers for details of their offerings. Non-GSM phones have similar features. GSM SERVICE PROVIDERS: There are at least 147 countries and territories providing GSM mobile telephone service. Below you will find links for each of these to the www.gsmworld website which provides direct links to each of over 400 different service providers. Many of the service providers show coverage maps on their websites and many provide various levels of service. (One quick word about types of mobile telephone service. First, let me point out that in the United States these services are normally called 'CELLULAR TELEPHONES', but in the rest of the world the term 'MOBILE TELEPHONE' is more common.) Links to the GSMworld website (opens a new browser page)
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