Provided the handset is not locked to a network then yes.
it is easy all you have too do is buy a phone and put yoursim card in the new phone you have
Yes
Simple Answer...No I switch my sim card al the time when my brother-in-law gets a new phone, he has a contract w/ nextel and I have a pre-paid boost mobile, so yes you can
Nothing is 'free' !... Ultimately - every phone has to be paid for by the consumer - whether that's by elevated minute costs, or tying the consumer to a lengthy contract.
Yes you can. . . .for example you can put a at&t prepaid go phone SIM into an at&t contract phone and it will still be prepaid.
You do not need a contract with a Net10 phone. It is a pay as you go cell phone service. Most of the time all you have to do is buy a service card. . .
If the card was activated, yes the fees are collectible. Once a card is activated, usually via the person's home phone, it becomes a valid contract.
The cell phone industry provides various phone types without having to be locked in to a contract. Android-driven phones, flip phones and different phone models are offered without any need for long-term contractual requirements. For those who do not use a cell phone often, the no contract phone is perfect for trips and emergency contacts. The simplicity of purchasing a card with specific amounts of time creates a ready to use telecommunication device that is ready when you need it. The no contract phone is great for children. Manage their minutes through single purchases of minutes allowed.
http://www.americanroaming.com/
You can not use a sim card in another cell phone carriers phone. They can only be used for the same carrier.
Yes you do for credit card checks
yes