Samsung GIO | Phone/Device Issues and Features | Consumer forum

Have an unlocked Samsung Gio that works fine with Rogers pre-paid. Purchased a Speakout SIM card and activated. Able to send and receive text messages as well as receive phone calls - but cannot initate phone calls. Tried the SIM card in a Rogers pre-paid Samsung Corby Plus and inbound/outbound calls work fine. Put the SIM back in the Samsung Gio and outbound calls do not work - I get "Unfortunately, we cannot complete your call as dialed. Please check the number and try your call again". Also tried a second Speakout SIM card in the Samsung Gio and it experiences the same issue of not being able to complete outbound phone calls.

Any ideas? Thx!