The best replacement for pay as you go is contract.

The best alternatives to pay as you go are rated as following:
★★★★★  contract
★★★  prepaid
★★  fully funded
★★  pick your plan
★★  sim free
★  pay monthly
★  heartless crew
★  pay by the day
★  monthly
★  pay as you use
★  sim only
★  ibr
★  travelcard
★  contract iphone
★  contract which is better
★  contract mobile phone
  bill pay
  contract smartphone
  contract phone
  funded
  contract phones
  heartless
  prepaid cell phones
  sim free phones

Your alternative for pay as you go is not listed? Suggest!
Speaking about pay as you go, one probably shouldn't forget about cingular.

Other search terms related to pay as you go and their ratings are:
★★★★★ cingular
★★★★★ free phone
★★★★ unlimited texts
You have in mind a companion for pay as you go and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pay as you go in all years. Click on graph for more.
pay as you go
contract
prepaid