Welcome to Android Central! The only way to remove preinstalled apps is to root the phone. Your other option is to get a Nexus phone (Nexus 5 or 6), which comes with minimal bloat (generally just Google apps).
Poor signal is usually related more to your carrier, although some phones do have better radios than others. But it's also worth noting that the number of bars depends on the software that converts the signal to a graphic representation, and the software can differ as well. So the same signal might be 2 bars on one phone and 4 bars on another.
06-11-2015 09:05 PM