SimPill was used during a 2007 trial in South Africa to ensure people took their medication for TB, . In the pilot, 90% of patients complied with their TB medication compared to 22 to 60% take-up without it. Developed by David Green, a South African GP. SIMpill uses a prescription bottle with an embedded mobile phone chip. Basically, it is a pill bottle that uses mobile phone technology to remind people on medication to take their pills on time – and it warns the patent if they are about to take too much.