I have a samsung HTC I took it to a koodo store got a prepaid sim set it all up online. with the unlimited text base plane and the 500 minut call booster. and paid for it then i put it in my phone, the phone recognizes a sim card but says limited service and will not let me text or call help?
You can't have a Samsung HTC. Those are 2 different manufacturers.
Make sure 2G isn't enabled under Settings > More... Mobile Networks and airplane mode isn't on. Try taking out the SIM card and battery (if possible) for a minute and try again. Sometimes there's a delay for prepaid activations.