Iphone4 can't connect to carrier

I have an Iphone4 that was dropped in the water.  I took it apart and cleaned it with alcohol and everything is working..... except it will not connect to a carrier.  I can use the wifi but not it wont connect to any carrier.  Please help!!!  Is there a part I need to replace?  Thanks for any help you can give.

I guess your definition of "everything is working" is different from most folks.
There are no legitimate sources for iPhone parts. Since you opened it, Apple won't touch it.
Find a competent 3rd party repair shop or buy a new phone.
It would have been much less expensive either way to have just gotten an out of warranty replacement from Apple for $149.  you don't have that option now.

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