What Router/Solution from Peplink allows for Bonding? I was under impression from Marketing material that Balance 20 was capable?

Product Discussion
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There is an option using cloud. See Balance 20 WAN Bonding

For Balance series have a look at Peplink.com - Model Comparison and about half way doen if shows the options for hot failover, WAN smoothing and Bonding.

For Mobile devices see similar table at Peplink.com - Model Comparison
HCG