GSM Phones

To make international cell phone calls in most countries when traveling, you will need an unlocked GSM cell phone. Sometimes called world phones, global phones, GSM SIM phones, mobile phones or travel phones, GSM phones may operate on 4 frequency ranges but most commonly on 900, 1800 and 1900 Mhz frequencies. They are a big improvement on older CDMA technology which had many limitations.

Cell phones using old CDMA technology are quickly being outdated by the new GSM phones. Your next cell phone may well be a GSM type phone as all the major manufacturers are producing more of these phones. GSM SIM phones allow the use of an international number where others can reach you regardless of where you are traveling. It's one of the best features of a cell phone with international roaming capabilities. GSM technology allows for users to use any GSM service provider they wish to, provided the phones are unlocked. This can result in better, more reliable service. The phone call voice quality is better too.

General Subscriber Module type cell phones are known as GSM phones. This brilliant adaptation of cell phone technology provides consumers with flexibility in which cell service they might use and which phones they can use. They also provide international roaming capability allowing vacationers and business travelers a single consistent cell service and phone connection as they travel from country to country. This is particularly convenient for those traveling to Europe as they travel through the UK, France, Spain, Italy and Germany. Many European and Asian countries have GSM service providers however they may have locked GSM services which means customers are restricted to a particular country or that specific cell service provider. Unlocked GSM phones give phone users freedom and flexibility and are a far better choice for you if you travel. A proprietary locked GSM phone service from Orange, O2, Virgin Mobile or T-mobile many not have good connections in various countries and their minute prices may be much higher. You don't have be trapped in a proprietary GSM service with that providers limited range of cell phones. Buy the right phone and get the best service plan such as Roamsimple's GSM service plans.

GSM phones are similar to your traditional cell phone with the exception of a SIM card slot. This slot is where the separate SIM card is inserted. SIM cards are small printed circuit boards contained within a credit card sized card which you purchase. You punch out the card along the perforated edges and insert it into your GSM phone. The GSM SIM card actually activates the phone service and identifies you as a subscriber on the recognized network. The phone searches for cells in the vicinity which may be of 4 different frequencies. When it finds a cell, it requests a connection using the information in the SIM card -- the IMSI data. The Subscriber Identity Module (SIM card) contains account information about the service and subscriber (the IMSI data). The individual operator networks in a country can identify the card as legitimate with the use of this International Mobile Subscriber Identity code. Mobile operators connect mobile phone calls and communicate with their market SIM cards using this IMSI data contained in the card.

Some providers such as RoamSimple, offer GSM Phone SIM Card packages that give you an all in one solution. That's very convenient since you'll know the GSM phone and SIM card are compatible and will work in the particular country or region you're traveling to. Some GSM phones may even have GPS navigation capabilities. Get your UK GSM phone SIM card package here. RoamSimple's Euro SIM Card is a UK GSM SIM Card, France GSM SIM Card, Italy GSM Sim Card, Germany GSM SIM Card all in one. No matter where you're traveling from Dusseldorf to Berlin and onto London, Rome and Paris, RoamSimple has the only GSM Card you'll need.

Unlocked GSM Phones

GSM phones are manufactured by major electronics manufacturers such as Motorola, Nokia, Sony Ericsson, Samsung, Siemens, Logitech and Blackberry. These brand name products are often used exclusively by the major cell service providers such as Orange, O2, Virgin Mobile, Nextel, Bell, Rogers, and Cingular, yet the services are often restricted to a particular type of phone. The GSM phone or the SIM card may be "locked" and can't be used with another carrier. These restrictions can be very annoying, and there may be requirements for further payments to the service provider if the customer wishes to unlock the phone. A smarter choice for consumers are unlocked GSM phones which allow choice as to which SIM card carrier service they would like to go with, thus to access better service in that particular country or to enjoy better international call rates.

Check out RoamSimple's array of GSM phones and SIM Cards, particularly the combined GSM phone sim card packages for great savings.