Is there any "free" or DIY hardware that can run OsmocomBB or a similar stack? AFAIK OsmocomBB only runs on certain old GSM phones. Did anybody try to build a

Is there any "free" or DIY hardware that can run OsmocomBB or a similar stack? AFAIK OsmocomBB only runs on certain old GSM phones. Did anybody try to build a GSM (UMTS, LTE, ...) client, say, with a FPGA and a transceiver, or with a SDR? I know high-frequency stuff is not exactly DIY, but there should be some off-the-shelf generic hardware by now that would be able to run such a stack, I would think.