The FOSA 4G LTE USB Portable Router promises a lot with its ability to support up to 10 devices simultaneously, offering high-speed internet access through 4G networks. It's designed for convenience, powered via USB, making it ideal for travelers who can use it with power banks or car chargers. The device also boasts WPA/WPA2 encryption for secure connections.

However, user experiences vary significantly. Some users report difficulties with setup, particularly concerning the lack of a provided password and insufficient instructions. One user mentioned having to photograph and reprint the manual just to read it, only to find it unhelpful.

Another common issue is compatibility with SIM cards. Several users found that their SIM cards did not work with the device, leading to frustration especially when needing reliable internet on trips. Despite these setbacks, some users have successfully connected their devices using information found on the sticker under the cover.

In conclusion, while the FOSA router has potential as a portable internet solution, its effectiveness heavily depends on proper setup and compatibility with your SIM card and network provider. Potential buyers should consider these factors before purchasing.