Important posts about unlocked cell phones and unlocked cell phone technology.1.What are Unlocked Phones?
2. How to buy a cell phone without a contract?
3. What are GSM Frequency Bands?
4. What is a sim card?
5. What Gsm Frequencies are used in the United States?
6. List of GSM & 3G frequency banded used from Afghanistan to Zimbabwe
7.What is 3G?