Remove the SIM card. Inspect the gold contacts. If they’re dull or spotted, gently clean them with a pencil eraser (sounds weird, works perfectly). If the card is bent or cracked, request a replacement SIM from your carrier. Most will send one for free. The Nuclear Option: Force 2G or 3G Only Some HSPA modems get stuck trying to connect to a weak 4G or LTE signal that can’t complete the handshake.
Most HSPA modems run on prepaid data plans. Carriers have become aggressive about deactivating inactive or low-balance SIMs. Your modem will show a perfect signal, authenticate with the network, and then refuse to pass data. hspa usb modem not connecting to internet
HSPA (3G/3.5G) technology is older than 4G and 5G, but millions of these modems are still in use because they are cheap, reliable, and work in fringe coverage areas. However, when they fail, the fix is rarely what you expect. Remove the SIM card
