You would get the Invalid SIM message if you insert onto the phone a SIM from a different carrier. This means that the phone is locked, so you would need to unlock the phone first before you can use the phone on a different service provider.
You call your carrier and activate your sim card.
The plural form of SIM card is SIM cards.
sim card
sim card
A SIM card adaptor will allow you to use a micro SIM in a standard SIM slot.
yes
NO
A sim card is Non of them
The sim card.
it does not have a sim card.
a prepaid Sim card is a Sim card that you pay as you go AT&t tracfone and t-mobile