Odp: New phone..where to get?
Dont ever try to turn on device after droping it in water, because you might kill it. let it dry for 2 weeks and then try
Re: New phone..where to get?
If your phone doesn't make it:
You say you want a phone under $500? And that works on the T-Mo network? With 4G speeds (HSPA+)? Then look no further than the LG Nexus 4. It is far better than the One S. And it is only $350 on the Google Play Store (not including S&H). Check it out.
That is my recommendation.
If, however, your current phone DOES make it, you should stick with it. No need to spend money if you don't have to. But it would certainly be worth it.