I'm not sure if this is the correct forum for this? I had a flakey external modem that I took to the Vodacom 3g shop to see if they could get it working properly, but not joy, its kaput. Now I've reverted back to the internal modem on my HP Probook 4310s. I slipped the SIM card back into into slot under the battery (several times), but the HP connection software says "No SIM card". I'll try another SIM card later, but I wondered if this crops up a lot and if theres a standard solution? I guess "replace the SIM card" will be the response! Any ideas would be appreciated.