When i got my nexplanon on, my arm has been having this numbing feeling. it's been 4 months and the numbing tingling sensation is still happening when im sleeping or just on my phone with my hands up.

See your doctor: Hi, I'm sorry you're having these symptoms. It sounds like you may have had an issue with the nexplanon hitting a nerve as it was inserted. Any time you have a surgical procedure, nerve issues can be a common complication. The good news is this tends to work itself out within a year (but can take up to a year). Please see your doctor if still concerned. Good luck!