My wifes i4 has yellow tint screen along with issues with bars dropping. She stated today had several drop calls due to no bars. However her battery life is steller she is down to 91% on her phone and ready around 1 hour usage and 4 hours standby so far. My phone has no yellow tint. No issues with dropping bars however the battery seems to drain faster. Still running test on the battery to confirm this. Service bars----At one point my wife and I had cell phones beside each other mine had 4-5 bars and hers at 1 Strange indeed while holding in hand.