Im not sure if a V3 can connect to a V1.Though it can connect to other V3's.
How to connect V3 to V3:
1) On both your Tamagotchi's, select the fifth option, on the top.
2) Select VER.3
3) Select either, gamne, present of visit, depending on what you want to do. (make sure you do this on both Tama's)
4) Now, put both Tamagotchi V3's up next to eachother. Now on only one of your Tamagotchi's click the [ b ] button, (middle button) it will connect both of them.
Wallah!
How to connect V3 - V2:
1) On both your Tamagotchi's, select the fifth option, on the top.
2) On the V3, select option OTHER, cant exactly remember what option to use on V2, try both options, V1/V2.
3) Now on only one Tamagotchi, press the middle button, when 'stand by' appears. (Make sure you are holding the Tamagotchis close together)
//Haze