‘And by the hands of the apostles were many signs and wonders wrought among the people, and they were all with one accord in Solomon's porch.'
The Apostles continued to gather in Solomon's porch to teach, and there they performed many signs and wonders. God was working through them with signs following (Mark 16:20). Their fame was now continually spreading.
‘They were all with one accord.' This would seem to mean the body of believers who continued to accompany them at various times, (although certainly not all the 5000 at once), although some see it as meaning just the Apostles.