I can call out on my IPhone but do not receive incoming calls. What is the fix for this?

Department store

2266 Wyoming Blvd NE, Albuquerque, NM 87112, USA

Shopping mall

2200 Louisiana Blvd NE, Albuquerque, NM 87110, USA

Department store

6100 Paseo Del Norte NE, Albuquerque, NM 87113, USA

Men's clothing store

6601 Menaul Blvd NE, Albuquerque, NM 87110, USA

Chamber of Commerce

400 Tijeras Ave NW, Albuquerque, NM 87102, USA

Sporting goods store

2720 San Mateo Blvd NE, Albuquerque, NM 87110, USA

Custom t-shirt store

5404 Central Ave SW, Albuquerque, NM 87105, USA

Shipping and mailing service

933 San Mateo Blvd NE Ste 500, Albuquerque, NM 87108, USA