iPod Touch + Blackberry Curve

I would've loved to replace my last year's gifted Blackberry Curve with the new iPhone, but considering the cost of data plans for smartphones here in Peru, that's just impossible for me. So I'm planning to get a last-gen iPod Touch to form a rudimentary mobile duo with my responsive-in-what-I-expect Curve, which basically, I would just use for WhatsApp and phone calls.

What do you guys think? Given my specific circumstances its my proposal worthy?