You can't extend your internal memory.
But you can make your sd card work like internal memory.
For that you have to root your phone and install Link2sd or App2sd software.
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I have an Ace with 2.3.4 Android version and S5830DXKPD Baseband version. I'm planning on upgrading to 2.3.6. Anyone has feedback on Ace running on 2.3.6? My device has delays and lags on applications and I'm hoping that upgrading it will fix the issue so I would appreciate your responses to this post. Thanks!..
I have successfully rooted 2.3.6. xxkpp
And yes its better than previous versions.