Thank you very much for responding. I looked up how to remove the SIM card from the 1661 and did so. It does not appear to be the right size. It's only 2.5 cm by 1.5 cm, which, from what I can find at least, is a mini card. On the 711 site it says the BLU needs the "full size SIM" and you've used the term "standard". I'm assuming those refer to the same thing and the BLU requires a much larger SIM card than what the 1661 has.
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