I have just purchased a recon Samsung S8 to replace my S5. Having moved my sim across (GiffGaff) I have found that if I try to call someone, a second or two after the call is connected, there is a loud feedback style noise making the call unintelligable. The phone was purchased as unlocked from a major high street chain. Any ideas what could be causing hits?
Yes, I put the sim back in my old phone and it works. I've been in touch with the retailer with the hope of getting a reply (thank you Covid19) but just trying to cover all bases. Thanks.