cheap SIM card; budget SIM
Typically refers to a low-cost SIM card provided by an MVNO (mobile virtual network operator) in Japan, as opposed to a major carrier's SIM.
I switched to a cheap SIM card and cut my monthly communication costs in half.
Cheap SIM cards are much cheaper than those from major carriers.
Standard written form combining kanji and Latin script; commonly used in Japanese.
Variant with katakana シム instead of Latin SIM; also seen in practice.
Compound of 格安 (かくやす, 'bargain-priced') and ＳＩＭ (シム, 'SIM card'). The term became common in Japan with the rise of MVNOs offering low-cost mobile plans.