Yes you have to get the same phone through insurance whether instore replacement or asurion. You can try drying it out and taking it in for service and see what they do. Just because the liquid indicators show that the phone has come into contact with liquid does not mean they automatically flag the phone as water damage. I used to work for Sprint and the technicians are supposed to open the phone up and examine it even when these indicators have been tripped. I have had the indicators change on my phone just by being in my pocket on a hot summer day.