3Mobile
Bishan Junction 8, Bishan Central #02-32 S(579837)
Compass One, 1 Seng Kang Square, #B1-08 S(545078)
Hougang Mall, 90 Hougang Ave 10, #04-17 Hougang Mall S(538766)
Ion Orchard, 2 Orchard Turn, #B4-22 S(238801)
J.E.M, 50 Jurong Gateway Road, #04-38 S(608549)
Vivo City, 1 Harbourfront Walk, #02-216B S(098585)
The Poiz Centre, 51 Upper Serangoon Road, #01-07 S(347697) 

HandphoneShop
Bishan Junction 8, Bishan Central #02-30 S(579837)
Bukit Panjang Plaza, 1 Jelebu Road, #03-16 S(677743)
Compass One, 1 Seng Kang Square, #B1-12 S(545078)
J.E.M, 50 Jurong Gateway Road, #04-38 S(608549)
Jurong Point, 1 Jurong West Central 2, #B1-97 S(648886)
Lot 1 Shoppers' Mall, Choa Chu Kang Ave 4 #03-17 S(689812)
Vivo City, 1 Harbourfront Walk #02-216C S(098585)
Waterway Point, 83 Punggol Central, #B1-33 S(828761)
Paya Lebar Quarter, 10 Paya Lebar Road #B1-26 S(409057)

Concept shops (Samsung)
Plaza Singapura, 68 Orchard Road #B2-23 Singapore 238839
Vivo City, 1 Harbourfront Walk #02-28/29 Singapore 098585
Westgate, 3 Gateway Drive #01-01, #02-01 Westgate Singapore 608532