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Most of the time a phone is either CDMA or GSM. What I've seen looking through the specs online is that the S5 is an either/or phone. (There are some phones that have both, and the S5 Duo has 2 SIM slots for GSM, but you'll have to check).
If GSM is available there will be a SIM card slot above the battery that you put your SIM card in. Usually it's as easy as slipping the card in and turning the phone on. Your provider should be able to help you get it working as well.
As far as I know, Metro is a CDMA wireless carrier, T-Mobile is GSM. Your Samsung SCH-R820 works on CDMA, which don't need a SIM card to work. GSM technology does need a SIM card to work and make calls. As you can see, there is no way that you can use a CDMA phone with a GSM wireless carrier.
There are new high tech phones that works both, CDMA and GSM, these are called World Phones. Sorry, and best of luck.
i think your phones is programmed for suppoting one kind of sim card chech if your handset is cdma or gsm if its is cdma it will not suport gsm sim cards but it will support all kinds of cdma sim cards and if it is gsm it will support only gsm sim card not cdma if its is progrmmable phone take to service center and check whether the phone have the capability to support both gsm and cdma