My phone is not charging- what can u do?

review this support article

If your iPhone or iPod touch won't charge - Apple Support

try a different cable, try a different charger..

if you look up into the charging port with a flashlight, do you see debris in there?

If so and you have to clean it out.. make sure to power off your phone (Settings > General > Shut down)

then use something non metallic (ie a toothpick, possibly shaved down to fit better) to carefully pull out any obstructions

What is the model, software version, date you replaced..... The charger, the charger cable?