GSM Technology in USA
Friday, September 21st, 2007As my living in USA series continues, I bring to you the perils of bringing a mobile handset from India.
First of all, a brief background on the technology behind GSM. The simplest way to put it is that your mobile handset is a glorified two-way radio. As you would use a radio to listen to an FM channel on a particular frequency, your mobile phone also listens on a specific frequency (to be precise, a set of frequencies). The GSM standard has allocated 4 bands worldwide, namely the 850 MHz, 900 MHz, 1800 MHz and 1900 MHz bands. All operators in India use the 900 MHz and 1800 MHz bands, while operators in the US use the 850 MHz and 1900 MHz bands. GSM World has some good information regarding the usage of the bands and coverage sorted by operator.
From my perspective, if you are going anywhere on the east coast or in Silicon Valley, you are well off with a decent tri-band phone like the Nokia 6681. Basically, you want to make sure that your phone supports the 1900 MHz band also, since a lot of operators here seem to use that particular band. You are even better off with a quad-band phone. One such phone is the Sony Ericsson W300i.
It is possible to get a phone here. Operators usually bundle a phone free of charge when you buy a plan. Or you can get a phone of your choice, at a discounted rate. The disadvantages that I see with this model are as follows:
- Your phone is tied to the operator. You cannot take your phone from, say AT&T and use it on T-Mobile. This is because there is something called a network lock that is placed on the phone, and usually only the operator can deactivate the lock. However, there exist sites where you can get the phone unlocked, usually for a fee.
- You are tied into a contract for a specified period of time, usually one or two years. If you decide to terminate your contract, you have to pay an early termination fee. From the point of view of the operator, this is normal, since they subsidize the costs of the phone and recover those by having a two year plan or whatever.
- If you are going to be in the US for only a short trip, it is usually not worth getting into a contract. However, there are some pre-paid plans, although I have seen it is not as popular as it is in India. Post-paid is usually the way to go.
I hope this should be enough information for you to make a choice.