Can I put my iPhone sim into an old blackberry?

I'm going on my D of E expedition next week and need to take a phone for emergencies but I don't want to take my iphone because its too valuable and the battery is so rubbish it wouldnt last 5 days anyway. I have an old blackberry and was wondering if I can just put my sim card from my iphone into it? I'm on contract with o2.

Yeah but you need an adapter you usually can get them from your provider

Before your iphone sim card, Make sure your sim card is fit on your Blackberry phone and your phone should be unlocked one. If it's locked by particular network means, you will need to unlock your phone. For unlocking you can approach your service provider or else try to buy an unlocking service from any one of the online unlocking service provider like http://www.theunlockspot.com/blackberry/rs5wp8/ I hope it will be very useful to you.