Are there any signs which suggest that a customer is loyal or not? If yes, What are these signs?

Very simple just directly ask the client if he would recommend the service or product to anyone else.

1) If a frequent customer provides you an opportunity to correct any mistakes the company may have made on an important order.

2) When the customer selects your company even if there are others who offer better pricing, due to the rapport you've built with the client.

3) The customer prefers to deal specifically with you and no one else.

4) The customer starts talking to you about their personal life, which shows that you have completely gained their trust and business. 

Signs for loyal customers:

1- repetitions of buying.

2- Recommending others for the same.

3- Sharing the feed back with the company. 

1. The customer refuses to buy from another company
2. buy more than product
3. spread the company reputation in his/her society

There are a quite of few signs that show that customer is loyal to you:

1) He give you repeat business

2) He only buys from you no matter how high you price is(he's looking for service not price)

3) Most importantly, he will recommend you to others.

if he/she will recommend the service or product to anyone else, also if he/she willing to buy/get another service/product.

Without customer you don't have business , so , its very I important to get customer loyalty which is easily determined via his sales or visits records  ( loyality program must be available ) , and telling his friends , family , etc....... 

Yes. They will not settle on price comparison with your competitors. They will settle on the quality of your product and the good relationship established mutually. They will treat you as a business partner not a supplier.

yes ! a customer is loyel when he keeps buying the product or getting a service from us no matter the price and when he talks about us and recommending others (friends , family...) to take the same product or getting the same service. 

the major signs of loyal customer are as follows

1. gives repeat order

2. recommend product or service to other.

3. provide their valuable feedback to the company for the betterment.

4. inclination toward the company or product/service even if there is a price hike.