Please provide hosts with an option for a working app on iphone four. I am unable to respond in a timely manner because the Airbnb app is not working on my iphone. I'm not sure what changed but I can no longer access Airbnb on my phone. I am not able to resolve the problem. I could not respond to an inquiry in a timely manner because I only had access to my iphone. Please help me with this. I cannot seem to obtain any help through the help center. Regards, Cecilia Hobson, 14 Mile Lakeview House