3G-HWIC is intended to be used as a backup path when primary fails.
So you can use it in DDR scenarios: the cellular interface needs to dial to start to be of use.
Among DDR scenarios there is the dialer-watch feature that can be used to have the cellular interface to dial when specific routes learned by a dynamic routing protocol disappear from routing table a clear sign of a problem over the primary link (that can be connected to another router this makes the difference with backup command for example).
you should be able to use OSPF on a cellular interface like it happens for an ISDN circuit.
But there are some notes:
you should avoid to include OSPF among the definition of interesting traffic or the cellular interface will stay indefinitively up.
you may need to implement OSPF specific features for on demand circuits
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