FAAC gates help - code change from previous owners

[Ranch2]

Hi all,

Brand new here!

I've recently moved into a new property with already installed FAAC double gates, they work great BUT the other night I found the previous owner on my driveway (inside the gates) as they were coming to collect some old bits but rather than wait for me to arrive they used the gate code to allow entry

This has freaked me out a little and I now want to change the code on the gates for our new ownership, I a) have no clue how to do this and b) am worried it'll mess with the 'you can ring the gates from your mobile to open them' function too?

I've been told by the PO that there's a sim card inside the gates and this needs topping up for the mobile function to work, usually a £10 top up lasts 2-3 months?? again no idea if this can be brought into this decade as it seems a bit faffy to have to remove a sim and top it up every quarter?

Hopefully someone can offer a noob some help and advice

Many thanks

Glenn