They get recycled
By selling it to mobile phone recycling companies.
You can sell it to to mobile phone recycling companies, If you sell your old mobile phone to a mobile phone recycler, You will get cash in return, which is a much better option than throwing it away or stacking it. There are various websites that can give you cash for your old and outdated mobile phone. The amount that you will receive in return will largely depend on the condition, model and the age of the cell phone
Traditionally people recycle a mobile phone when they buy a new handset or upgrade via their provider. This can be done in a variety of ways, the simplest of which is to use a specialist recycling company. These companies offer fixed prices for handsets based on age, the model, condition, and can also pay for old chargers and batteries.
yes
One can get free ugrades for an old mobile phone by contacting the mobile store or personally going there with the phone. Sometimes, when a person has been a customer of a mobile company for years, one gets a new mobile phone for less money or even for free.
You may be able to purchase a mobile phone battery from either a carrier or any electronics store that sells mobile phones. The battery might be in-store already or may have to be shipped. Unfortunately, phones are considered "old" rather quickly which may make it hard or impossible to find a replacement battery.
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disposal
put new freakin batteries dont be stupid
If you can change the ownership of the phone account, you can use the phone as your own.
You can but the charge will not last as long the phone will go dead faster
Recellular.com is probably going to be your best option for used cell phone batteries. I was unable to find other sources for this type of thing. You can buy them right on their website.