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The sim card will only work in a different phone if the phone is ulocked, in not, no
The LG MG800 phone does is not capable of holding 3 sim cards. There is only one sim slot on this phone.
No, the sim card is located in the top of the phone only.
Only if the phone is not locked to t-mobile.
Only if your texts are saved to the phone and not to the sim card.
You can not use a sim card in another cell phone carriers phone. They can only be used for the same carrier.
Only if the SIM card has been unlocked first.
Absolutely. The SIM carries the service information for your phone while the battery only provides power to the phone.
Assuming the handset is unlocked - yes you can. The phone will simply generate a bill with the provider of the SIM card.
No most phone companies do not allow any SIM card to go into all phones. The only exception I have found is the SIM cards for ATT phones and TMobile phones.
I dont think so only if the payg sim is the same network as the contract sim
A phone SIM card is built to an industrial standard, they will fit and work in any phone manufactured by any manufacturer - they all have and provide standard SIM card connectors. However, some Mobile Phone companies who "give" you a free phone as part of a contract deal with, them LOCK the phone to their service (in software in the phone), which means that that phone will only work with a SIM card provided to you by them. It is possible to get the phone "unlocked" or to purchase a "SIM free" phone which then allows you to use any SIM in the phone.