I would try offering him alternative things to chew or play with when he is tempted to go after something you donāt want him to. To prevent my sun conure, Elly, from chewing at my shirt while sitting on my shoulder I will give her a piece of wood to chew on or some sort of foot toy to mess with. Sometimes she will want to sit on my head and nibble at my hair, and I just remove her and place her back on her perch and with something appropriate to chew at.
As for the cellphone issueā¦. Is he being aggressive towards your phone and trying to attack it? Or is he just wanting to play/chew it? If it is an aggressive thing, this reminds me of Elly with random objects, as well. There are just certain seemingly random things she just does not like and will either bite me or bite at the object. Many times itās the sounds these objects make when in use that bothers her. Certain game controllers, using a calculator, the presence or rustling of SOME plastic bags, the popping on and off of the caps of chapsticks (or even me applying chapstick) or the screw caps of plastic bottles. These things just trigger her to go into attack mode for some reason.
Over time, I have been able to get Elly to tolerate some of these things through training. It can take a lot of patience, and sometimes there will always be some things that just set them off. There are still times where I will just put Elly in her cage while Iām using something she wants to attack. So, you can either just not have your bird have access to your phone or you can try to build tolerance through training.
I do clicker training with Elly, which is really effective in my experience. Even without a clicker you can try rewarding your bird when it doesnāt react to the presence of your phone.
At first, you can have your phone near your birdās cage, so they canāt actually get to it. If they start reacting aggressively to the phone (like trying to get to it or biting at their perch) wait until they calm down and then reward/give a treat. Start by having your phone further away and gradually move it closer to your birdās cage until they donāt react to it at all. And then you can try outside of the cage. Sounds tedious, I know, but it may work.