How to I improve signal strength between my RFLKT and my phone?

1- Try riding with your phone in a saddle bag or the right side jersey pocket. Sometimes if you ride with it in a center jersey pocket your body can block the signal

2- If you have a case on your phone please try removing the case, some cases can weaken the signal strength

3- Always make sure your RFLKT and Wahoo Fitness App are fully up to date