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If your SIM card is too big, it won't fit in the slot of your phone. If it's too small, it might get stuck or not connect.
Here at 1pMobile, we send out a triple SIM. The SIM starts at the standard size and you can push the card out to make two other sizes - micro and nano - to suit your needs.
If you keep the parts to the triple SIM and need a larger size later, just pop the smaller card back into the larger piece and you're good to go!