Stop sleeping late, and start asking for help.

#include <stdio.h>
#include <string.h>

int main(void)
{
	int needInput = 1, test=0;

	char telNum[11];
	while (needInput == 1) {
		printf("Give me a phone number ");
		scanf("%10s", telNum);

		for (size_t i = 0; i < strlen(telNum); i++)
		{
			if (telNum[i] >= '0' && telNum[i] <= '9') {
				printf("This is a number %c\n", telNum[i]);
				test ++;
			}
			else
			{
				printf("This is not a number %c\n", telNum[i]);
			}

		}
		// (String Length Function: validate entry of 10 characters)


		if (test == 10) {

			printf("Yep, thats a phone number \n");
			needInput = 0;
		}
		else {
			printf("Enter a 10-digit phone number: \n");
			test = 0;
		}
	}
}