Micro-sim cutting is an absolute pain in the ass! Because once cut you can never use your sim-card ever again in your non micro-sim card phone. For you to use the same sim card - now cut down - in your old phone you need to use a sim-card adapter. Only problem is, these sim card adapters aren't suitable because imo they are not the correct size because every phone is differerent so what happened to me was when i inserted the sim card adapter into my old phone, it bloody got stuck inside and wouldn't come out!
Had to take it to a repair shop and when the technician eventually removed the sim-card adapter it had damaged my phone, specifically a section of the motherboard and i had to pay £20 to get it fixed!!! I am never putting a sim card adapter in my phone ever again for fear of the same thing happening! Once you cut the card down, you're stuck with it for life! So say for example your micro-sim compatible phone gets damaged or broken and you want to revert back to your old non micro-sim compatible phone, you will need to use the sim but with it being cut down it's now become a massive headache! So get used to it never being used in your old phone unless you know for certain the sim card adapter will not get stuck!
Honestly as far as i'm concerned it's a massive pain the backside! The whole thing pisses me off!