Just keep it simple
Unless you know & fully understand all the functions and how the data, history etc. is stored/transferred & so on, and how to protect your ID & activity on the various smart phones etc. Not just think you do
Always best to use a cheap simple PAYG burner phone no unnecessary bells & whistles on the bloody thing
So if anything goes tits up, you can chuck the phone, better yet dismantle the phone then chuck
And no trace whatsoever can be made back to you, no email, credit card the list goes on and on. Everything leaves a trace but you don’t want it leading back to you
to be extra careful do not make calls from your home etc., switch of your phone well before you get to your place of work or home etc.
As a phones position can be triangulated from the phone masts etc.
Technology exists that can switch on your phone remotely, to listen what’s going on also to triangulate the phones position etc. so remove battery
Although your phones number would have to of been connected to something quite serious for someone to do that,
but consider this do you know everything what the WG’s phone is used for , who is she in contact with ,also what else could she be involved in/with etc., could be something pretty fucking dodgy & serious !
So just be aware & careful