My new SIM card will not allow me to send BBM messages?

Hi, so I got an upgrade and upgraded my Blackberry to an iPhone. However, I kept my blackberry and bought a SIM card which was £20 for 6 months of BBM, in order for me to talk to my boyfriend who is in the army. I put my new SIM card into my blackberry and it didn't work - no signal or anything. I took it to the shop and they said I had to have it unlocked, I did this and immediately got signal but my BBM messages won't send. Can anyone help?

Please and thank you so much!

Its BLACKBERRY Messenger for a reason! Its not available for iphones!

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