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Infuse is incompatible with Straight Talk. The ST network is CDMA, while the Infuse is GSM/HSDPA. Even if you had another GSM phone, it still wouldn't work, because Straight Talk uses TracFones... which are tied to that service even if unlocked.Does the infuse need to be rooted/unlocked to use Straighttalk sim?
From Wikipedia:I'm currently using my samsung infuse with the new Straight Talk SIMs
I had to unlock my phone though you can do it at cellunlocker .net

From Wikipedia:
"Straight Talk now offers service for Android phones: Samsung Galaxy Precedent and LG Optimus Q which can be used with $45 Unlimited plan and make use of the Sprint CDMA network."
Since the Infuse is not a CDMA phone, tell us again how this works...?
Also, from the straighttalk.com TOS:
"If you are using your own unlocked phone with a Straight Talk SIM card, it must be compatible, and not interfere with, our service, and must comply with all applicable laws, rules and regulations. Devices capable only of using data service are strictly prohibited and Your use of any such device is grounds for immediate deactivation and termination of your service without a refund. You are responsible for ensuring that any unlocked wireless phone that you use is compatible with the Straight Talk wireless service and that your phone meets all Federal laws and standards. You are further responsible for the purchase and maintenance of any additional hardware, software and/or internet access required in order to use the Straight Talk service. Straight Talk service will only work with wireless devices that are compatible with our network. Not all services are available with all wireless devices or on all networks. We may remotely change your wireless phone