That depends on the carrier's coverage than the phone (unless it's an iPhone with an antenna that's placed so that holding the phone cuts the signal off - thanks,Steve).
A good photographer can take good pictures with a 3MP camera, a bad photographer takes bad pictures with a 42MP camera - or even a $3,500 Hasselblad. (Ansel Adams took some really great pictures with a $3 Kodak Brownie.) If you want to take great pictures, don't look at the camera specs, look at the camera app specs (and the ones that come with the phones are usually worse than the ones you can find for free at the Play Store) - and read everything Kodak has to say (online) about taking good pictures. Rule of threes, depth of field, learn how your app meters and where, and develop a photographer's eye. (One of my favorite pictures is looking through a wrought iron fence at a large expanse of flat, featureless snow, at night, with a tiny yellow car with red tail lights far in the distance. Stark black and white, and just enough color to make you gasp. Taken with a cheap 35mm camera with cheap film.)
Photography's like anything else - Babe Ruth didn't hold the home record for so long because he was such a precision hitter - he swung more than anyone else. (He also held the record for being struck out.) Take pictures. (With digital, it's free. Delete the bad ones if you need space.) Take thousands of pictures. That's how to take good pictures - with a box camera, a phone or the best camera ever made.
That's basically what Android is designed to do - use the SD card for saving files - songs, pictures, videos, documents - any files. Some people run apps from it, but that often doesn't work. Saving pictures to it always does.
(And remember a computer axiom - any file not backed up to at least 2 different destinations [like your laptop and a cloud account, or 2 (or more) cloud accounts] is a file you don't need.)
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