Residents are warned about a scam involving tax due to HM Revenue and Customs (HMRC).
Dorset Police said individuals are being contacted and told they have an outstanding debt with HMRC and can pay with iTunes vouchers.
In one day, 13 reports to Dorset Police from residents were mainly in the North and East of the county.
Detective Inspector Neil Wright, Force Volume Crime Unit, said: “I urge residents to be aware of this trend affecting Dorset. Tell your loved ones, your neighbours and your colleagues.
“This is a scam. HMRC will never ask you for iTunes vouchers or anything else similar as payment for unpaid tax.
“If you receive a suspicious call just hang up. Don’t engage with these people as it just gives them more opportunities to pull you in.”
iTunes gift cards are becoming popular as a way to collect money from victims because they are easy to redeem and quick to sell on.
You do not need to have the physical card to redeem the value. Often victims are asked to read out the serial code on the back over the phone which instantly credits their account.
If you are suspicious of an email or text claiming to be from HMRC, send it to firstname.lastname@example.org so it can be checked.