Because of iPhone's restrictions, phone calls made outside of Salestrail can't be logged automatically to Salesforce. We'd recommend you to call from Salestrail, using our "Search Salesforce" bar to access any contacts / leads you want to get in touch with. 

In order to log calls that have been made on your iPhone dialer, go to Unlogged Activities Tab and tap on calls you want to log to Salesforce. 

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