If you've been dealing with a poor cell phone signal, you might be considering a switch to a different carrier. Maybe one of the most reliable phone carriers will have a cell phone tower closer to your home or place of work, right? Well, it's certainly possible, but there are some simple ways you can improve your phone's signal without making a big leap to a new cellular plan. The SIM card could actually be the source of your signal issue if you've had your phone for a while. Android phones are getting rid of SIM cards, but for devices that still use them, wear and tear can cause connectivity issues.