Before you start

Passport plus valid visa (visitors), or a physical Iqama (residents)
An unlocked, GSM-compatible handset
Your physical presence, for biometric capture
For postpaid: an active Iqama and usually a Saudi account or card

Step-by-step

1
Buy a prepaid line on arrival at an official store
King Fahd International has carrier kiosks and STC, Mobily and Zain have stores across all three cities. Start prepaid — it activates on your passport and visa in a single visit. Avoid unofficial resellers; a line not properly registered to you is worse than no line at all.
In personWho: You, with a carrier agent15–30 minutesStarter packs roughly SAR 30–50
2
Complete the biometric capture
The agent scans your ID and takes a fingerprint that is verified against the national identity system before the line joins the network. Mandatory for residents and visitors alike, and impossible to do remotely — which is why an all-online arrival plan does not work in Saudi Arabia.
In personWho: YouSame visitIncluded
3
Migrate the line to your Iqama as soon as it is issued
A line opened on your passport must be moved onto the Iqama. Residents can usually do this in the carrier app via Nafath without returning to a store. Skipping it is what breaks Nafath and banking logins later, with no error that names the phone.
Mobile appWho: YouSame week as Iqama issuanceFree
4
Turn off automatic network selection if you live near the coast
Bahraini networks are reachable along parts of the Khobar and Dhahran coastline and around the causeway approach. Set your handset to manual network selection or lock it to your Saudi carrier, and disable data roaming, unless you want an international bill for a phone that never left the country.
Mobile appWho: YouDay oneFree — and it saves real money
5
Audit your lines on Mutasil
CST's Mutasil service lists every number registered to your ID, free. Use it to confirm nothing was opened in your name without consent and to check how close you are to the cap before you try to add a line for a family member or a work device.
OnlineWho: YouInstantFree
6
Order home internet against the building, not the coverage map
Fibre is widely available in the newer districts of Khobar and Dhahran and patchier in older Dammam, where 5G fixed-wireless is often the practical option. Ask the landlord what is physically cabled to the flat rather than what the carrier claims for the district.
OnlineWho: YouDays for wireless; longer for new cablingVaries by speed and technology

Documents you’ll need

Passport plus valid visa (visitors) or physical Iqama (residents)
Live fingerprint captured at the point of sale
Border entry number for visitor registration
Saudi account or card for postpaid direct debit

Things most newcomers don’t know

Your phone can roam onto a Bahraini network without you leaving Saudi Arabia.

The causeway is 25 kilometres of water and the Bahraini networks carry across it. Handsets on automatic network selection along the Khobar and Dhahran coast, and especially near the causeway approach, will occasionally register on a Bahraini operator and start billing international roaming. It shows up as an unexplained charge a month later. Lock the network manually or disable roaming and the problem disappears entirely.

Source: Community-reported across Eastern Province residents; carrier roaming behaviour

The SIM is the root of your digital identity, and a mis-registered one breaks everything quietly.

Nafath sends its approval push to the number registered against your Iqama. A line still registered to your passport, or held in an employer's name, causes silent authentication failures across banking, Qiwa, Absher and Muqeem with no message pointing at the phone. People spend days blaming the bank. Migrate the line in the same week the Iqama is issued.

Source: CST SIM registration rules; MoI Nafath

You cannot do any of this remotely, so plan the first 24 hours with data already sorted.

The live fingerprint capture means a store or staffed kiosk visit is unavoidable, and visitor eSIM activation inside an app is frequently blocked by a Saudi-ID check. Arrive at King Fahd International with roaming enabled or a travel eSIM loaded — the airport is a long way from the cities and you will want a ride-hailing app working before you clear customs.

Source: CST; carrier point-of-sale practice

The per-ID line cap catches people who worked here before.

Residents are limited to a small number of lines per Iqama, prepaid and postpaid both counting. The Eastern Province has a lot of returning contractors, and a dormant line from a previous rotation — or one an old employer opened — consumes the allowance and gets a new purchase refused at the counter with no explanation. Check Mutasil first and release what you do not need.

Source: CST Mutasil

Common mistakes to avoid

Leaving automatic network selection on near the coast and paying Bahraini roaming from inside Saudi Arabia.
Keeping the line registered to your passport after the Iqama is issued.
Using an employer's or colleague's number, so you do not control the identity your logins depend on.
Hitting the per-ID cap because of a dormant line from a previous contract.
Signing a home internet plan on a district coverage map rather than on what is cabled to the flat.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.