BB device needs to on the mobile data to connect to internet(even wifi).
you need to have any BIS service example is BBchat(the cheapest promo 99php BBM only).
Kelangan padin ksi matrigger yung internet service kea required na may subscription pa din.
Let me clarify thing a bit.
Blackberry devices 7.1 and below are not like other regular phones out there like samsung, apple, nokia, Sony and so forth.
For BB devices you need to have BB services like @ssoB_Yacci said. Because the said services will activate the wifi capability of the phone. Also known as servicebooks. BB devices had their settings/configuration hardcoded that BB services are needed to avail/use its full capabilities.