Hi. This is Robert from NET1O Wireless. No, inserting the SIM card from the old won't transfer the service. Let us first check if your Samsung phone is compatible/eligible with our network through the Bring Your Own Phone Program. To check the compatibility/eligibility, please text the keyword BYOP to short code 611611. If it is, you will need to purchase a Bring Your Own Phone SIM card. The remaining service days and airtime will be transferred to the new phone. To perform a phone upgrade, text the keyword Transfer to short code 611611.