How many channels can I register with a device in one REST call? Craig Conover December 08, 2020 14:03 Updated You can have up to 30K (30,000) characters worth of channel names (based on text size). Related articles How many channels can I register with a mobile device for push? Can I build threaded messaging app using PubNub? Does PubNub provide a premium SLA? Are push notifications stored and retrieved via history API?