This is a known bug/limit for Collector. Feature services (hosted or otherwise) do not show labels in Collector, UNLESS the map is taken offline. Then they show up, which is weird. Labels are added to the feature service in ArcGIS online, they look great in the webmap and webapp but NOT Collector. Esri's Flagship app for field data collection. Here's the annoying Rub: There's no plans to fix this. See for yourself. NIM103494: The Collector for ArcGIS application for Android doe.. and NIM103495: Add label support to Collector for ArcGIS ap.. same Bug for different mobile platforms. Scroll down and you can see that any fix is "Not in Current Product Plan" this bug is two years old it's not going to get fixed. I'm pretty sure there's a new app in development that will combine Collector and Explorer. But that's pure speculation on my part. Hack Workaround; Use a map service of your Same Exact data with pretty ArcMap labels and NO symbology. Result is that you have two layers in your web map pointing to the same data on your ArcGIS Server one is for editing (I always add a "EDIT" to the name) and one if for labels. ("TEXT") This is how we have to work around the negligence.
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