Click here to see the V3 character chart. If your character is not on that chart you might not have a Bandai Tamagotchi Connection (or Connexion) V3.
Here's how to tell which version Tamagotchi Connection/Connexion you have:
Step 1: look at the back. If it doesn't have "BANDAI" molded into the plastic it's not a real Tamagotchi.
Step 2: does it have an antenna bump? If it doesn't have any, it's probably a V1 or V2. To differentiate between a V1 & V2, open the Game menu. Version 1 has two games: Dance and Jump. Version 2 has four games: Jump, Bump, Heading, and Slot.
Step 3: V3 has an small antenna bump built into the casework.
Click here to see what the V3 looks like.
Step 4: V4 has a ball on the end of its antenna.
Click here to see what the V4 looks like.
Step 5: V4.5 has a star on the end of its antenna. I don't have any pictures of the V4.5, but it's looks the same as the Japanese model UraTama.
Click here and look at the ones on the far left (the pink one) and far right (the yellow one). The ones with the stars on the antennas are UraTamas. V4.5 look the same.