Travelling Smart Overseas With Your Cellphone

Some time ago, I was in charge of developing a business concern on the beautiful island of Sri Lanka while based in the United States. At one point, I needed to send an employee there to set up the quality control program. This employee did not have a GSM cell phone so I lent him mine to use "in case of emergency only". The employee spent time each night chatting with family on the cell phone and came back with a $3,000 phone bill in two short weeks.

If you have a US GSM cell phone and service account, you may find that it will cost you something in the range of $3 per minute to use your phone overseas due to international roaming. As an example, on one trip to Hamburg, I had lost my party at a very large exposition. I used my cell phone to call them and found out that instead of it being a local call, it went to the US and back via their networks thus charging me for two international calls!

A little while later I was on a plane to Sri Lanka. As we were about to land, the gentleman next to me took out a small bag and dumped the contents into his palm. They were SIM chips. I asked him what this was all about and he told me he was looking for his chip for Sri Lanka. He informed me that the chip enabled him to make calls in and from Sri Lanka without incurring the extremely high roaming charges my friend above met with. He traveled throughout Europe and Asia and had chips for each major locale.

I was intrigued by this idea and did some research on what it took to use these local chips in my cell phone. Here is what I found:

Your basic cell phone service provider places a unique serial number into your cell phone. This unique number is called an "ESN" and it is used by the service provider to identify who you are. The service provider uses this number to know where to send phone calls too when someone dials your number.