My iPhone 4s won't recognize my sim? - 1

I have an iPhone 4s running ios 7. It is locked to Globe Telecom (philippines). My mom got a new phone so this 4s is mine now. I cut my regular sized sim card to a micro sim. It fits perfectly on the sim card tray of the iphone. However, it says "No Sim". I tried inserting my mom's old sim which is deactivated and it detects it and says "No Service".

Why won't the iphone detect my sim? What should i do?

FYI, my sim is also a Globe telecom sim.

It is very common to screw up the sim when you try to cut down a sim, you need to buy a new micro sim.

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