DOWNLOAD WINNING PRIOR ART: https://www.unifiedpatents.com/insights/2024/12/17/lab-technology-location-tracking-patent-prior-art-found Unified Patents is seeking prior art on at least claim 1 of US-9578570-B2, owned by Lab Technology, LLC. Systems and methods for switching a voice call from an Instant Messaging (IM) based voice network to a second voice network. A telephone adapted to switch a voice call from an Instant Messaging (IM) based voice network to a second voice network. It has been asserted against Samsung, Anritsu, Quectel Wireless, and Ericsson. For more information on the patent: https://portal.unifiedpatents.com/patents/patent/9578570 View the Similar Documents (patents + scholarly publications) generated by Google Patents: Patents: https://patents.google.com/?q=(~patent%2fUS9578570B2)&before=filing:20151210 NPL: https://patents.google.com/?q=(~patent%2fUS9578570B2)&before=filing:20151210patents=false&scholar ** PLEASE READ THE RULES FOR THIS CONTEST BEFORE YOU DECIDE TO PARTICIPATE. ** ** TO QUALIFY FOR CONSIDERATION, A CLAIM CHART IS REQUIRED. ** ** PLEASE USE THE PROVIDED CLAIM CHART AS A TEMPLATE ** ** PRIOR ART THAT HAS BEEN PREVIOUSLY CITED DURING PROSECUTION WILL NOT BE CONSIDERED. **