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Yes
Theoretically you could but it would not be very smart financially. You would have to pay a monthly fee for the contract phone and service on it that you will not be using and you will also be paying for the service you will be using through your service provider where you got your SIM card.
Contact your service provider and they should be able to transfer your Pay and go contract to your sim and cancel your Contract account.
Yes you can.
Get a "pay as you go" phone plan. You only pay when you use it. No contract. Depending on the carrier you should be able to use any unlocked phone.
An unlocked phone can accept the SIM card from any cell phone provider. If you have an ATT SIM card, you can use it in an unlocked phone. A locked phone is created by the provider to force the use of its service; an unlocked phone can take any SIM card.
Whether or not you can use a 3 UK SIM card in a HTC HD2 T8585 phone will depend on where the phone was purchased and whether it was purchased as a contract or Pay as You Go phone. The SIM card can be used in the UK on an unlocked handset assuming that the card is still active and you may need to notify your network provider.
yes if 1: unlocked to any network 2: if bought on same network however the picture message settings and internet settings will probably have to be sent by your network provider as different from contract to prepay. UK only
Provided the handset is not locked to a network then yes.
That should be established in your phone contract.
It all depends if the phone is sim locked. There are never any restrictions on sim cards only on the phones you can use them in. If you have a phone that you want to use was originally from Telstra either prepaid or from a previous contract it wont be a problem however if your phone was previously for example on a Optus contract your mobile MAY be sim locked. It is not always the case that the phone is sim locked (sim locked means you can only put a sim card from the same company that originally supplied the phone) When purchasing a phone the best thing would be to check with your local Telstra or all phones dealer if the phone you are buying is sim locked to a particular phone company.
If you are on a contract SIM it will depend on the contents of your tariff. If you on pay as you go / pay as you talk it will cost you.