If your phone is a dual sim phone you can use at least two different service providers.
There are shops all aournd which will do this for you, however at a price, probably about $10-20
You can use a service like www.thelist.com to search for providers based on your zip code. You can also use your phone book to search for service providers in your area.
Yes, if there is cell service on the island.
Most carriers or cellphone service providers have roaming partners. They partner with the carriers in other countries, so you may still have signal when you travel abroad. But if you want to use SIM card from a local carrier, then you would need to unlock your phone first to do that.
There is an online service called FlexiSpy that you can use.
Call the company that provides the cellphone service--the company that sends you the bill for cellphone use.
Use different names.
Most service providers offer family plans or special plans for partners in which call made between the two phones work out much cheaper.
There are a number of ways through which you can check your cellphone bill. You use the internet or call your service provider for the same.
While there are a lot of cell phone plan providers there are some big names. For contract phones a lot of people use Sprint, AT&T, or Verizon. For pay as you go plans a lot of people use Tracfone.
Call customer service to find out how to transfer your service to the spare phone.
A service provider is an entity that provides certain services to other entities. Indemnity providers is a plan where a person can use any medical provider.
A System Development Life Cycle is the full sequence of events in the creation, use, maintenance and retirement of a computer system. Different service providers use different methodologies, with different naming conventions to describe the cycle.