Hi, thanks for the reply
If we put a UK SIM into the device and activate it, then it can send and recieve with no problems. If we then put the Hungarian SIM in with no changes to the device or the account, the user cannot send or recieve emails, and can only view his text messages stored on the SIM in the Messages application. This is one of the reasons I wanted to try activating with the new SIM in, to recreate the link to the BES account.
Thanks, thats good to know about the SMS messages!