We'd like to add a phone on our Sprint plan for DD17. Unfortunately, things tend to break quickly in her presence, so it'll be a older model or used phone. Would I be best getting a used galaxy S5 that we would be able to change the battery in (100 or under) or a new S9 (300 plus)? I already ordered a new battery to test DH's old S5, but I'm prepared to order a used phone if his doesn't work. This will be her first cell phone, but she's had iPods, tablets, etc. I'm sure it will get a lot of use data-wise.