Please look into the following

data on b1

+255612143990
+255621222177
+255621881044
+255622599107
+255623019600
+255624495460
+255625528345
+255627311080
+255627563446
+255627603636

need formula to do the following on c1 and downwards

+255 612 143 990
+255 621 222 177
+255 621 881 044
+255 622 599 107
+255 623 019 600
+255 624 495 460
+255 625 528 345
+255 627 311 080
+255 627 563 446
+255 627 603 636

Thank you