There is no physical phone number as we know that goes directly to Jesus if you dial it, the bible has not shared any physical phone number to us
but what the bible says and can be likened to a phone number is the concept of PRAYER
anytime you connect to God in prayer, you are automatically calling on Jesus attention, and Jesus will be at your beck and call even before you start to pray
Isaiah 58:9 KJV
Then shalt thou call, and the Lord shall answer; thou shalt cry, and he shall say, Here I am. If thou take away from the midst of thee the yoke, the putting forth of the finger, and speaking vanity
Psalm 91:15 kjv
He shall call upon me, and I will answer him: I will be with him in trouble; I will deliver him, and honour him.
And it shall come to pass, that before they call, I will answer; and while they are yet speaking, I will hear.