Sorting out SIM card for alarm system hub

[Lonelyguy38]

How things have moved on since last alarm now they all seem to want to have a SIM card installed in them.

With this in mind getting SIM cards is easy enough and I know where it goes on alarm. But the operators send out a code to SIM and being as it's in an alarm I can't view anything sent. I don't have any other phones and this is locked and not mucking with it. So I'm sure I'm not the 1st to ask but how do you go about getting confirmed/ verified if you can't see what's sent?

What would you say is average cost of these Sims monthly as surely it don't call anyone everyday.

Many thanks for any assistance 

[Bambino · Accepted solution]

@Lonelyguy38 You have to put the sim in a phone in order to receive the code. If your phone is locked to another network you'll need to borrow an unlocked phone.