arduino uno - GPS is not detected on SIM808 module! - Arduino Stack Exchange
Amazon.com: Wireless Quad-Band GSM/GPRS/GPS Shield Based on SIM808 Onboard CP2102 MIC29302 Phone Talk Speaker Module @XYGStudy : Electronics
SIM808 GPS / GSM Locator with Arduino - YouTube
GPS Car Tracker Using Arduino And SIM808 - ElectroPeak
Using DFRobot sim808 and tried another code where sim cards not need and checked the similiar problems on different forum. still won't work - Arduino SIM - Arduino Forum
SIM808 GPRS/GSM+GPS Shield v1.0 - Elecrow
Sim808 not working - Project Guidance - Arduino Forum
SIM808 GPS Active antenna unable to acquire fix - Solution - Embedded World