i second this! i had a nano simcard and purchased an adaptor after the 1st time it went in ok and needed to use the sim in a different phone for holiday came back and went to change sim card back and after swearing and being as careful as i could the sim came out the adaptor and got stuck it had bent the sim contacts. its currently being repaired by samsung. under warranty i dont know lol as ive not heard back and they seem to be going ahead with the repair.
I can confirm, even though I haven't used a nano to micro sim adapter. The clips are very sensitive, I nearly broke one by inserting a custom cut micro-sim. Luckally a needle and some tweaking solved the issue.
Samsung Galaxy Y GT-S5360 [GYA ROM 2.3.6]
Samsung Galaxy S4 Mini GT-I9195 [CM11 (4.4)]
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