From BBC:
Billed as a celebration for Best's life, the Manchester service features personal tributes from friends and former players.
The event is also being screened live for hundreds of people outside on the BBC Big Screen in Exchange Square.
The service, led by Dean of Manchester Rogers Govender, got under way at 1100 GMT with the hymn "Praise My Soul".
The service has been devised by the Northern Ireland star's family and Canon Paul Denby, who made the first address.
He said: "This is Manchester's chance to say goodbye, and to say it with thanks.
"George had God's gifts in abundance; the gift to play, to win, to entertain and to bring joy. We are richer for having known him, and he will always belong to us."
The Irish actor James Nesbitt also gave a tribute during the service.
Some quotes from the family ahead of the service:
Dickie Best:
"The response we have received from people is amazing. We have discovered how well George was liked. He was liked all over the world.
"I've always ever thought of him with the ball. He was made to play football. Every day is emotional for us. To us, George is still with us."
Ian Best (brother):
"Manchester played such a big part in George's life. It was his second home and to be here today means so much to us.
"The service will about the celebration of his life and we're really proud to be here for him."
Barbara McNarry (sister):
"Coming to Manchester for the memorial service is such an emotional occasion for us as a family.
"We've been amazed by the generosity of people. Everyone wants to help. The support we have received has been amazing.
"Manchester was always a special place for George, but I don't think even he realised how much people cared for him."