Can you do without a cell phone? If no, then you can use the iPod like a very small tablet. You can't use the tablet like a phone...there is a way, but I believe it only works with AT&T and there is a chance you can brick your tablet by doing so.
Both smartphones impressed when tested individually and have proved to be commercial hits. Apple shifted 5 million units in the opening weekend and Samsung revealed it sold 20 million S3 devices during its first 100 days on sale.