The best replacement for unlocked is locked cell phones.

The best alternatives to unlocked are rated as following:
★★★★★  locked cell phones
★★★★  jailbroken
★★★  locked iphone
★★  no contract
★★  locked phone
★★  locked cpu
★★  rooted
★★  contract
★★  locked phones
★  no contract phone
★  factory unlocked
★  jailbreak
★  locked iphone 4s
★  locked
★  locked cell phone
★  sim free
★  developer
★  jailbroken iphone
★  developer edition
  locked iphone 5s
  locked iphone 5
  locked processor
  off contract
  locked screen lol
  locked bootloader
  locked smartphone
  no contract phones
  locked blackberry
  never locked
  factory unlocked iphone
  locked mobile phone
  no contract cell phones
  no contract cell phone
  international version
  jailbreak iphone
  contract free
  locked gsm

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Google Trends

Scale is based on the average worldwide traffic of unlocked in all years. Click on graph for more.
locked cell phones