Amazon has a web page with details of the
free 4 months of Kindle Unlimited with Kindle purchase:
Quote:
Terms and Conditions
...
For existing monthly or free trial Kindle Unlimited subscribers who redeem this offer, renewals will be temporarily suspended for the duration of the 4-month period and will restart at its conclusion, unless you disable renewal during that 4-month period.
...
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It is oddly worded but to me it appears that activating it will extend your current free trial by four months.