BG7XSS https://gitee.com/bg4uvr/LTE-Tracker/blob/master/doc/make.md I found a place selling a very cheap D820W1.
Ironic The same manufacturer also offers integration-focused devices that are more advanced and cheaper.
BG5BVC Ironic This is very useful, and it's also affordable. I modified it myself, including upgrading the Type-C power supply for both car use and portability. Tutorial:https://gitee.com/ixinme/aprs4g/blob/master/make-it-your-self.md Thank you also to BG4UVR, BA7LHF, and BG2LBF for their work on the project.
BA4QAO I'm using the Yeruida 820UG board, and it's quite fun! Welcome to track https://aprs.tv/?call=BA4QAO-5G&tlen = 86400&state = track