Is it true that mobile phones emit signals that may be harmful to us?

YES IT IS TRUE IT WEEKS OUR NERVOUS SYSTEM 

yes its true.. mobile phone emits infra red rays which causes damage to the brain including nervous breakdown.

yes, its true. mobile phone signals can effect our brain

Yes. However, only mildly.

yes, emit harmful signals and the solution to decrease the effect percentage is to pot the phone away of ear by 5 cm that will not prevent the effect but will decrease the effect %

there is no conclusive evidence to suggest this

Yes only if a certain frequency is respected.

yes it is true but when they transmitted above normal level.  

Yes its true to some aspect but its all depends on usage of mobile phones yes its electronic device and some times produce electromagnetic signals with high aptitude; But safety measurements helps to reduce these effects:

always attend your phone call and listen from your left ear as right ear is very near to brain

Use Earphones of high quality brands as they are testing each of their product with different aspects 

Don't attend call while your phone is in charging mode as process of charging is in progress phone' battery receive the power what exactly its required and in case of extra power it discharge it through electrical signals that can hurt your heart and brain.

Use Light or Auto Brightness in phones to avoid high intensity lights that disturbs human high; light sensors in smart phone is added for this purpose its also helps in improvement of battery life !

Scientists say the signals have very low power that it does not effect us. Add to that no research or study proved that it could harm our bodies yet. 

There is no evidence for this.