Yes, it is possible to trace non-fixed numbers and text messages, although this typically requires specific tools. You can track non-fixed VoIP numbers and text messages with the help of internet service providers (ISPs) and telecommunications carriers. This process often involves identifying the IP address used during the call or message exchange, allowing you to determine the location or device involved. You can also use some apps and services such as reverse phone lookup that offer tracking capabilities for non-fixed numbers and texts. However, their effectiveness can vary, and you should be cautious of privacy laws and ethical considerations.