You might not be able to log into your account for various reasons:
1) You might have entered your mobile number or your password incorrectly.
2) Your account has been suspended if there seems to be odd activities within your account.
3) You may have requested for your Boost account to be suspended.
4) You may have reached the threshold of unique Boost account logins in your device.
If this issue persists, please submit a request and we will help you out.