My test GSM network is now up and running! Here are some pictures for your amusement.
A little case hacked together to keep things safe (and cool):
Network details from a survey on a Sequoia GSM tester. Note MCC/MNC set to 234/99 and ARFCN set to 512:
Network registration on an old Nokia MS:
Watch out for more blog posts over the next few days. PS: Calls into FreeSWITCH are working fine 🙂