Information about contacts:There are total 12 contacts and you get 100 xp for finding each one.
Go near the NPC and press left alt to talk and the contact will be added on your phone.
Each contact has its own advantages and you can access/call them from /phone > phonebook > use the arrow keys to move down!
I will explain city wise location of the contacts and a little bit about each contact below.
SF:1. Jethro:You can call this guy to get bombs, he can be found in San Fierro near Xoomer property at Easter Basin.
2. Dwaine:You can call him to repair your vehicle, he can also be found in San Fierro near the Hotdog van at King's.
3-4. T-Bone and Chastity:You can call T-bone for asassination contracts while Chastity can amuse you during your lonely time at home:DYou can find both of these contacts in San Fierro at Battery point near Rifa HQ.
Enter the building "Pleasure Domes" and you will find them there.
LV:5. Ken Rosenberg:You can call him to locate a lawyer, he can be found in Las Venturas at the Caligula's palace.
Enter the Building then go right, towards the bar counter and you will find him there.
6. John Sindacco:You can call him to sell your counterfeit chips,he can also be found in Las Venturas at Whitewood Estates.
Go to his office by passing the maze...
7. Juliet:Do i have to explain this one as well? Oh! well...You can call her to your house and you know what to do...( ͡° ͜ʖ ͡°).
She can be found in Bone Country at ''The Big Spread Ranch''
Enter the Building and go near to talk to her
( ͡° ͜ʖ ͡°)LS:8. EmmetYou can call him to get armour or buy heavy weapons such as RPG etc,he can be found in Los Santos at Willowfield.
9.Pulaski:You can call him to locate police bribes,he can be found in Los Santos Police Department.
Go inside the building and walk straight then go left(up the stairs) and you will find him.
10.Nikki:You can call her to your house and you know what to do...( ͡° ͜ʖ ͡°), she can be found in Los Santos at Idlewood in the dance club.
Enter the Building then go up the stairs and go near to talk to her
( ͡° ͜ʖ ͡°)11. Fufu:You can call her to your house and you know what to do...( ͡° ͜ʖ ͡°), she can be found in Los Santos at El Corona near the airport inside the Nude Shop.
Enter the Building and go near to talk to her
( ͡° ͜ʖ ͡°)12. Sapphire:You can call her to your house and you know what to do...( ͡° ͜ʖ ͡°), she can be found in Los Santos at East Los Santos inside "The Pig Pen" building.
Enter the Building and go near to talk to her
( ͡° ͜ʖ ͡°)Credits:ExcaliburDz0ny