Yes, but it can be somewhat mitigated by not using SMS or iMessage.
Don't share the phone number of your sim with anyone for any reason whatsoever (or don't put a sim in the phone at all and use an external wifi router (this is what I do), or use a data-only sim), and ensure that iMessage and iCloud is disabled.
This doesn't make your phone invulnerable, it just makes it less vulnerable.
Don't share the phone number of your sim with anyone for any reason whatsoever (or don't put a sim in the phone at all and use an external wifi router (this is what I do), or use a data-only sim), and ensure that iMessage and iCloud is disabled.
This doesn't make your phone invulnerable, it just makes it less vulnerable.