After testing the TALKSIM Unlimited Data SIM card in my unlocked hotspot and security camera for a month, I've got some thoughts to share. The setup was surprisingly simple - just pop in the SIM, enter the APN (unet), enable roaming, and you're good to go. The automatic carrier switching between AT&T and T-Mobile is a nice touch.

The 10GB trial data worked exactly as advertised. I used it primarily for my outdoor security camera and mobile hotspot during road trips. Speeds were decent (around 20-30Mbps on LTE) when connected to AT&T's network in my area. However, when it defaulted to T-Mobile in certain locations, speeds dropped noticeably.

What I love: No activation fees or contracts is a huge plus. The flexibility to use this in multiple devices (I tested it in a tablet too) makes it great for IoT applications. The unlimited data (with throttling after high-speed allowance) gives peace of mind.

What could be better: The post-trial data plans are pricey compared to some competitors. Also experienced one random dropout that required a device reboot - not ideal for critical IoT applications.

Final verdict: If you need a no-fuss data-only SIM for IoT devices and can live with potential network fluctuations, this is worth considering. Just be aware of the pricing structure after your trial period ends.