Just unlocked Blackberry Curve 8520 with online code, now cannot make calls or send sms! PLEASE HELP!

Hi,
I unlocked my phone about an hour ago using a legitimate unlock code from unlocks.co.uk. I entered the code and it seemed to work fine and now my network shows up as Vodafone uk (I have unlocked it from T-Mobile)
It looks as though it is unlocked and I have checked the connections - I have signal and it says I am connected to the vodafone network, however, I cannot make any calls or send texts! If I try to call a number I get the call failed signed and the failed call dial tone. I tried to send a text but it didn't work - the text now has a red X and says 'unidentified subscriber'. I know this is a fault with my phone as the people I have tried to text and call have no problems with their phones/networks.
Please somebody help me! I have no idea what to do! I contacted the unlocking company and they say if I'm sure the sim I'm inserting is active (which I am) then it is likely my phone has been blacklisted, but I dont think it has. I bought it as a pay as you go handset from Argos just a week ago and it's been working fine until then. 
I put my old t-mobile sim back in and it seems to work - does this mean it hasn't been unlocked successfully or not? 
Many thanks

Do a simple reboot on the BlackBerry in this manner: With the BlackBerry device POWERED ON, remove the battery for a minute, and then reinsert the battery to reboot. A reboot in this manner is prescribed for most glitches and operating system errors, and you will lose no data on the device doing this.
Then try your Vodafone SIM again.
1. If any post helps you please click the below the post(s) that helped you.
2. Please resolve your thread by marking the post "Solution?" which solved it for you!
3. Install free BlackBerry Protect today for backups of contacts and data.
4. Guide to Unlocking your BlackBerry & Unlock Codes
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