As long as your phone is not SIM- or network-locked, then yes, you can switch carriers.If notyou have to get your phone unlocked from any vendors online like unbblock.com for blackberry phones and Simpleunlocking.com for other model phones
There should be no problem if you use a SIM card in an unlocked phone. If the phone is locked make sure the network is available to you.
GSM phones will only work in Trinidad and Tobago if they have a SIM card available to use with it, especially for international phone calls.
When you format your sd card to your cell phone, you are enabling the phones features to work with and save the data inside the card.
Go phone sim cards only work with go phones; you'd have to unlock the matrix.
If the phones are from the same service provider then the sim cards will work in either phone. (i.e. Both phones were purchased from T-Mobile)
Yes, SIM cards can be reused for other phone plans, whether they are on the same network or not. If you are changing network provider, you will need to request the NAC or network access code from your current provider.
Yes, they do. They are great for the light cell phone user.
Cricket Communications uses CDMA, so their phones do not have SIM cards.
Unlocked GSM cell phones should work with any provider. You will be able to tell one the sim card is put in the phone.
Unlocked phones are GSM phones that will work with any GSM carrier. A GSM phone works on AT& T, T-mobil and any other system that is GSM compatible. Most inetrnational cariers are GSM.
Cell phones require: a cellular network, an activated and live SIM Card, and a charged battery (this is assuming that the phone itself has no problems).