Hi Hellann, thank you for visiting and posting on the Cricket Community Forum! Placing your current SIM card in the Samsung Galaxy S8 will switch your service to that device. Your phone number is linked to your SIM card. Once the Samsung Galaxy S5 is taken off the account, you can then activate another line of service with that phone.
Thank you for visiting and posting on the Cricket Community Forum! You can transfer your current Cricket service to your new iPhone by placing your SIM card into the device. However, if you need a different size SIM card, you would have to visit your local Cricket Wireless store.