The best replacement for sim card is sd card.

The best alternatives to sim card are rated as following:
★★★★★  sd card
★★★  cdma
★★★  phone memory
★★  memory card
★★  micro sim card
★★  micro sim
★  sim card
★  no sim card
★  micro sd card
★  microsd
★  nano sim
★  mini sim
★  smart card
★  smart chip
  64k sim card
  normal sim card
  32k sim card
  mini sim card
  micro sd
  cingular sim card
  iphone 3 sim card

Your alternative for sim card is not listed? Suggest!
Speaking about sim card, one probably shouldn't forget about iphone.

Other search terms related to sim card and their ratings are:

★★★★★ iphone
★★★★ phone
★★★ iphone 5
★★ puk
★★ ipad
★★ puk code
★★ tray iphone
no contract
gps activated
boost mobile phone
phone number
my iphone
prepaid phone
You have in mind a companion for sim card and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of sim card in all years. Click on graph for more.
sim card
sd card