More About GSM Cellular Phones 

You will need a GSM unlocked Tri or Quad Band Cellular Phone in order to use our Global Sim Card.

To purchase a phone go to the bottom of this page!

What is GSM?
GSM (Global System for Mobile Communications) is the world's predominant mobile phone standard, first adopted in Europe and then quickly spreading throughout Asia, Africa and the Pacific Rim (Australia, N. Zealand, etc.). GSM enables the same cell phone to work in London, Johannesburg, Beijing, Sydney and elsewhere.

The United States however, did not standardize GSM as a part of it's infrastructure, instead leaving the development of cellular service to competing wire carriers which created whatever standard they wished including CDMA and TDMA. Only recently has the US aggressively embraced the GSM standard. 

Carriers such as T-Mobile and AT&T are now providing GSM service in the majority of the markets they serve. However, the GSM standard that we use in the US and Canada is not always compatible overseas. This explains why many US travelers have difficulty getting wireless coverage overseas without paying extremely high roaming fees and other charges. You need to make sure your phone will work with the frequency of the country to which you will be visiting.

What is a SIM card?
The SIM (Subscriber Identity Module) card also known as a "smart chip" is basically the "brain" of the phone, providing cellular service as well as many other functions including call log, voice mail and SMS and GPRS (internet connection standards). SIM cards are the size of a credit card but they have a pop-out chip about the size of a postage stamp which fits into all modern GSM phones. The smart chip is embedded with circuitry and when inserted into a GSM mobile phone provides wireless phone service on a particular GSM network.

I currently have a GSM Phone. Will it work overseas?
Our Global SIM card works in most of the current GSM handsets, which are unlocked. Be sure you have an unlocked phone. Older cellular phones may require you to make use of a menu in your phone to place outgoing calls. 

Most phones bought from GSM carriers/ operators are usually locked to accept only the SIM card of that particular carrier.

1. Some carriers will provide you with the SIM unlock code once you have been a customer for a few months.
2. Otherwise use the yellow pages, or the internet to find someone who will unlike your multi-band phone.. Cost should be about $20 to $30.
3. Google "unlock cellular phones" and you might find a list of websites offering the service for free.

If you do not have a newer GSM Tri or Quad band cellular phone, or, you are not sure if your phone will work overseas, then make absolutely sure by purchasing our GSM Phone / SIM Card Package shown below.

Motorolla V Series GSM Phone, Plus SIM + $25 Air Time 
$185 (Plus Shipping) 

Please Call us at 314-640-0261 to Order Our Phone - SIM Card Package

Not sure your phone is unlocked or works worldwide? Then guarantee your CelTrek service with our fully loaded unlocked Motorola V series Quad band phone package!  Our V series Motorolla flip phones come with High Res display, MPC ring tones and all your other favorite features.  Also included is a battery,  charger and ear piece.  We will load and activate the SIM card for you and ship the phone ready to be used once you travel out of the country.