Fixed Line lookalike Clearcom units

During Oct 2014, the WIMAX facility at our home failed. The Telkom tech guy came and told to us that Telkom no longer supported WIMAX, and he installed a small wireless modem with a SIM card. This unit had belonged to someone else, and the technician promised to sort it out. He failed to do so, and in desperation we called at the Telkom office in Eastgate. The lady was helpful and told us the we should rather get the \Clearcom"unit with the phone and SIM card. This would give us data and a phone line. She also informed us that we needed to change the battery in the unit every 3 months or so. I asked where we could obtain these batteries"