The best replacement for fi is wireless.

The best alternatives to fi are rated as following:
★★★★★  wireless
★★★★★  3g
★★★★★  wi max
★★★★  fantasy
★★★★  bluetooth
★★★  ti
★★★  jl
★★★  fe
★★  na
★★  wireless internet
★★  sundown
★★  kindle 3g
★★  re
★★  dc audio
★★  ni
★★  re audio
★★  carb
★  midna
★  audioque
★  cellular
★  horror
★  ssa
★  bose sounddock
★  broadband
★  dd
★  wimax
★  co sap
★  low fi
★  kicker
  blue tooth
  nook 3g
  fe socionics
  kindle 3g wi fi
  science fiction
  wireless lan
  fii
  carb blackbird
  wireless router
  solid state hi fi

Your alternative for fi is not listed? Suggest!
Speaking about fi, one probably shouldn't forget about blue oval logo.

Other search terms related to fi and their ratings are:
★★★★★ blue oval logo
★★★★★ blue circle logo
You have in mind a companion for fi and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of fi in all years. Click on graph for more.
fi
wireless
3g