Before you start

Passport plus visa for a visitor line, or a CPR card for a resident line
An unlocked handset
Your physical presence for identity verification at an operator store
For postpaid: a Bahraini account or card, and usually a salary certificate

Step-by-step

1
Buy a prepaid line at the airport or an operator store
Batelco, stc Bahrain and Zain all have stores across Manama and desks at Bahrain International. A prepaid line activates on your passport in one visit and gets you working immediately. Avoid informal resellers entirely — a line not registered to you causes problems you cannot fix later.
In personWho: You, with an operator agent15–30 minutesStarter packs are inexpensive
2
Move the line onto your CPR the week it is issued
A number registered to a passport must be transferred to your CPR once you are a resident. Skip this and government logins, bank verification and some delivery and payment services start failing in ways that never mention the phone as the cause.
In personWho: YouSame week as the CPRFree
3
Lock the network manually if you live near the coast
Along the west and north coasts and near the causeway approach, Saudi networks are reachable, and Qatari signal can appear on parts of the coast too. A handset on automatic selection will register on a foreign operator and start billing international roaming from inside Bahrain. Set manual network selection to your Bahraini operator and turn data roaming off.
Mobile appWho: YouDay oneFree, and it prevents a real bill
4
Switch to postpaid once salary is flowing
Postpaid plans are better value at any real usage level and bundle data generously. They need a CPR and usually a salary certificate or bank account. Number portability between operators is available, so you can move without changing your number.
In personWho: YouMonth twoPlan-dependent
5
Arrange home broadband against the lease
Fibre is widely available in Manama, Seef, Juffair and Amwaj; older buildings may be on copper or fixed wireless. Installation needs the CPR and normally a tenancy contract. Ask the building — not the operator's postcode checker — what is actually in the block, because the answer varies floor to floor in older towers.
In personWho: YouDays to two weeksInstallation plus monthly plan
6
Get a causeway data plan before you need one
If you cross to Saudi Arabia regularly, buy a regional bundle or hold a Saudi eSIM rather than paying default roaming. The difference over a few weekends is substantial and it takes ten minutes to set up in advance.
Mobile appWho: YouBefore your first crossingBundle cost, far below default roaming

Documents you’ll need

Passport with valid visa (visitor) or CPR card (resident)
Unlocked handset
Tenancy contract for fixed broadband installation
Salary certificate or bank details for postpaid

Things most newcomers don’t know

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

Twenty-five kilometres of causeway is not far in radio terms, and along the western and northern coasts and near the causeway approach a handset left on automatic network selection will find a Saudi operator and register on it. The billing is international roaming and it appears weeks later as an unexplained charge from a country you did not visit. Manual network selection plus data roaming off removes the problem entirely and takes thirty seconds.

Source: Local coverage geography; operator roaming practice

The line must be on your CPR, because the CPR is the login for everything.

Bahrain's government services, bank verification and payment apps all authenticate by sending a code to the number registered against your CPR. If the line is still on your passport, or worse on a colleague's or an agent's identity, those checks fail — and the error messages talk about your account, never about your phone. Migrating the line is a ten-minute errand that prevents weeks of confusing failures.

Source: TRA registration requirements; bahrain.bh eKey

Fibre availability is a building question, not an address question.

Manama's building stock ranges from 1970s blocks to towers finished last year, and fibre has been laid unevenly. An operator's coverage checker answers for the area; what matters is whether the fibre is terminated in your actual building and floor. Ask the building's watchman or management company which operators are already wired in, and ideally ask a neighbour what speed they really get, before you sign a lease you intend to work from.

Source: Local network practice; TRA

Number portability is real here and worth using.

Bahrain's regulator mandates mobile number portability, so you can move between Batelco, stc and Zain while keeping your number. Because your number is tied to your CPR and to every verification flow you rely on, being able to switch operator without changing it removes the main reason people stay on a bad plan. The switch takes a visit and is free.

Source: TRA — number portability

Common mistakes to avoid

Leaving the handset on automatic network selection near the coast and paying Saudi roaming from home.
Leaving the line registered to your passport after the CPR is issued.
Signing a lease in an older building on the assumption that fibre reaches your floor.
Buying a SIM from an informal reseller rather than an operator store.
Paying default roaming on causeway weekends instead of a regional bundle.

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