Pairing Smart bulbs to Vodafone wifi

[Garfy77]

Hi 

Just moved from BT to Vodafone for our broadband. 

My late wife had moved us onto Teckin smart bulbs through the BT router and Smart Life app. 

But since changing can I for the life of me get anything to reconnect / pickup the new wifi. 

Will I have to try and split the frequencies onto the 2.4gHz to connect everything? and if so how? Running the latest router. 

Or is there another way? Tried the guest network but no joy and bought a TP Link network booster thinking this may create a new wifi link to put all the bulbs but no. 

Any help / comments appreciated. 

[Ripshod]

If you haven't reset too many of them it'll be worth setting wifi ssid and passwords the same as they were on the BT router. Just one option that'll save a lot of faff.