How an experimental physicist lives

Dec 15, 2014 living US cellphone


The radio frequencies used in US for cellphone communication are different from those in China and Europe. A cellphone in China or Europe cannot be used in US and vice versa, unless it supports multi frequencies.

Carriers and dealers

A carrier is a company who provides you cellphone communication service. Its service may be provided through dealers. Page Plus is a carrier providing cheap and flexible service.


A set of service is called a plan. There are roughly three types of plans:

  • contract. You sign a contract with a carrier, paying fixed amount of money monthly for 2 or 3 years. Normally one can get newest cellphone models for free. But the monthly payment is rather high.
  • prepaid. There are two sub categories:
    • You pay fixed amount of money monthly.
    • pay-as-you-go. You pay certain amount of money and the cost of each call is subtracted from it each time you make a call.
  • postpaid. You pay what you spent at the end of a certain period. You need some credit to choose this plan.

Pay-as-you-go is the cheapest if you don’t need the newest phones.



Blogs on physics research and educational activities of Jing LIU, an assistant professor in physics at the University of South Dakota. He is an experimental physicist developing novel particle detectors for astroparticle physics and civil use.