Your cell phone or home phone can sometimes be filled with static and other sounds when trying to make a call. This can be determined by many factors including the network coverage, phone line quality, and signal strength in a certain area.
There are a couple of ways to increase cell phone and home phone clarity. You can us a cell phone antenna signal booster in order to increase the signal strength to your cell phone. This is best used in areas with bad or marginal cell phone coverage. Cell phone calls will sound clearer than before, with increased signal strength.
Some cellular providers may offer a service which places a router, acting like a signal repeater in your home and amplifies the signal, allowing you to get better clarity when making a phone call. All of these solutions will work very well if you need to increase clarity of a phone call. Coverage may also be expanding in many areas, allowing you to get good cell phone signal strength in areas you wouldn't have before.
You should also try to move away from metal roofing, and walls as they can sometimes affect call clarity significantly. With home phones, clarity between handsets and the base can also vary. Many of these phones include a clarity booster, which increases the sound level by 20-35 decibels, making it much easier to hear and understand the person on the other end of the call.
Home phones can also be affected by interference, as many of them use the 2.4 Ghz frequency band used by many other devices, including wireless routers. This problem is usually resolved by switching them to another frequency, such as the 5.8 Ghz band. Phone call clarity is also determined by your distance from the local telephone exchange and the quality of the phone line in your house.
The first problem cannot be resolved, as it is the problem of your telephone service provider. The second issue can be resolved by changing the bad quality phone line inside your home. As a last resort for cell phones, you should consider changing to another cell phone provider, as they will have different coverage areas. One carrier may have marginal coverage in your area and another will have excellent coverage in your area.