Hello @BenG14 ,
At this time, the ability to add duplicates of the SMS number is considered a glitch, not a function or feature. SMS numbers have to be considered unique for the sake of complying with permissions and regulations, similar to email addresses.
The SMS addition issue, as well as the request for clearer messaging on contacts errors, have both been tracked to your account. If and when there's an update on either, the devs will notify you directly.
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