Cell phone manufacturers install certain codes to unlock their devices. You usually have to purchase this code and have access to the device's serial key. You can obtain these codes through numerous sources such as eBay and "unlocking" websites. Free alternatives that might work would include emailing/contacting the carrier your phone is locked to (eg. Verizon, AT&T, etc.) and mention that you're traveling out of the country and require an unlock code to visit while using the local provider there. (Or really come up with any sort of excuse. They usually give in.) Don't forget to ask for specific instructions on your model of phone! Different phones require different methods of unlocking.
You must unlock it.
To do that follow the instructions here
It depends on the phone and carrier.
The best cell phone carrier depends on you. It is up to you to decide which cell phone carrier would be the best. Each person has their own picks and what works for one might not work for you.
No, phones are programmed for the carrier, so if it was a Verizon phone, it was programmed for Verizon. It will not work on another carrier.
If you are trying to unlock your Samsung phone so you can use a SIM card from a different GSM carrier on it, then you would need an unlock code for it which is calculated off of the IMEI # of the phone, model of the phone and the carrier to which it is currently locked to. Unlock codes are unique to every phone. Any random codes would not work in getting it unlocked.
You do infact need a special code to unlock your locked cell phone. Many times of you call your cell phone service provider they will give you the code required to unlock your phone. If that option does not work there is many sites that offer unlock codes for free as well.
in order to allow your phone to work in other countries you wil have to unlock it from your current carrier i unlocked mine at unlock att .com and now it works in egypt !
i got mine to work with c spire at unlockatt.com they unlock any phone to any carrier
An air card will work overseas. It depends on whether your cell phone carrier has towers in the area.
Any cell phone that is unlocked requires a SIM card to work. If you own a Sidekick cell phone that is unlocked you are able to use a carrier other than T-Mobile. For this reason, it will require a SIM card to work.
All the major phone carriers do offer Samsung phones, but each carrier only offers different models. You will have to check to see what particular phone your friend has and then look to see which phone carrier offers that phone.
All cell phones are limited in transmit power by the FCC but reception sensitivity can vary a little bit by manufacturer. The biggest variable is the the cell phone carrier (Sprint, Verizon, AT&T, etc.). Find the carrier that has the strongest signal in the area you're most concerned about. Then choose a phone that uses that carrier.
You should consider purchasing the Apple iPhone. If your carrier does not carry this phone you can always have it flashed to work with your company that you use.