To make calls heard louder, there are a few strategies that can be implemented. First of all, make sure you have a suitable calling environment, with good sound quality and no external noise that could interfere. Also, use a good quality earphone to improve sound clarity. Second, adjust the volume of the phone or device from which you are making the call to ensure that it is at an appropriate level. If you still have difficulty hearing, you can politely ask the other party to speak louder or move closer to the microphone.