Learn how to insert SIM Card on your HTC One Mini. Use a standard micro SIM only. Inserting a smaller size SIM (such as nano SIM with an adapter or a modified SIM) may cause the card to not fit properly or damage the card slot.
Take the back cover off.
With the micro SIM cards gold contacts facing down and its cut-off corner facing in, insert the micro SIM card all the way into the micro SIM card slot.
Push the micro SIM card in until it clicks into place.
Note: Make sure to switch off HTC One Mini before removing your micro SIM card.
Take the back cover off.
Push the micro SIM card in to eject it from its slot, and remove it.