Definitely disable 2G from your phone. New versions of Stingray (aka IMSI catcher) could work in 4G but 4G is still a massive uplift from 2G.
IF you are all clean now, you can contact your MNO saying you suspect there is an “jammer” and see if they will investigate. I don’t know much about Canada so it might not be a good idea if the Government / LE love deploying mass surveillance tech.
As good practice, please refrain from sharing your new phone number with anyone / business, use it as DATA only.
My practice is:
- Government / Bank Service SIM - always unplugged
- Work SIM - always unplugged, set to forward all received calls to SIM 4. (As it is cheaper than using VOIP service in my area)
- Shopping SIM - always unplugged
- Data SIM - Change every few months as daily driver, incoming calls only, NO Outgoing calls, not giving the number to anyone.