We have 50 user licence for ArcGIS Online. Is this mean that we can collect data at the same time with max. 50 user? Or is it possible to collect with more than one phone/tablet logged in to the same user's account at the same time?
Thanks for the question, named user accounts are intended to be used by one person only (though that person could be signed into his/her tablet and phone at the same time to do work), they are not intended to be shared among multiple people. You can find more detailed information on the use of named user accounts under : http://www.esri.com/legal/pdfs/mla_e204_e300/english#Addendum_3