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You don't need a Cellphone to validate and open an account. just an email will do as per AMD REWARDS Website: AMD Rewards
SIGN UP FOR AN ACCOUNT
Enter your email address and mobile phone number to receive two codes to enter for instant account verification. One message will be sent to your email account, while another will be sent to your mobile phone.
If you only enter your email address and do not provide your mobile phone number, there will be a 24-hour waiting period to verify your account.
AMD REWARDS just asks for your Name, Birth date, Email Address, and Location to sign up for an account to redeem you Free games coupon.
If they should ask for your Home Address is probably to know where to ship the games or to notify the Games owners where to ship the games.