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Hello, We have been using Diafaan for a while now with Sierra 313U modems on a Windows Server. They work fine for a few weeks, then lock up and I usually have to swap them out. We have three of them and usually I can get one to work but currently they are all locked up. Can anyone suggest a different brand/modem GSM modem to try? I am looking into using Clickatell but they want me to set up a brand and give them tax information to get set up, which is a lot of trouble for a test.