The Activation Process of GP Bundle has been changed now.
First, you need to purchase the bundle from MyGP App or www.grameenphone.com/hoichoi
Once you bought the pack then you need to simply login with the Same GP No. from the Hoichoi App using GP Internet (Mobile Data not Wi-Fi), then your GP BUNDLE will activate successfully automatically.
If the Bundle is Not activated successfully, you need to Contact with GP. As the Activation Process is solely handled by Grameenphone.