Why does WhatsApp say 'We couldn't call your number'?

This error usually occurs when trying to verify a virtual or VoIP number. WhatsApp's security systems detect the number type and block the verification call. SecondSIM provides a carrier-grade UK eSIM that is recognized as a physical mobile device, ensuring the verification call or SMS arrives instantly.

Can I use WhatsApp Business on the same phone as my personal WhatsApp?

Yes. By using SecondSIM, you can have two active lines on one device. This allows you to run the standard WhatsApp app for your personal number and the WhatsApp Business app for your SecondSIM number simultaneously, with complete separation of chats and contacts.

Why choose an eSIM over a free virtual number for WhatsApp?

Free virtual numbers are public, shared, and often already banned by WhatsApp. They are flagged as 'Non-Mobile' in the GSMA database. SecondSIM provides a private, dedicated UK mobile number on a Tier-1 carrier network, offering permanent ownership and 100% verification success.

Network Active

The Only Way to Get WhatsApp Business Working 100%.

Verified Mobile Profile

Active Business Line

Stop wasting money on apps that WhatsApp bans. Get a real British mobile number that gives your business "Instant Trust" from the very first message.

Get Your Number Now

Instant QR Activation

Designed for Enterprise Reliability.

Bypassing the shared-pool risk. Your business identity is built on dedicated carrier infrastructure.

Instant SMS Delivery

Bypass IP-based lag. Our eSIMs communicate directly via real carrier networks, ensuring verification SMS codes arrive in seconds, not minutes.

Banned Number Protection

WhatsApp filters out "virtual" numbers. We provide fresh, clean UK numbers registered as physical mobile devices, ensuring your business stays active.

Real SIM Status

When verification systems check your number, they see a "Mobile Connected" status, bypassing the blocks often applied to software-based apps.

How It Works

From purchase to verified business identity in minutes.

PHASE 01

Get Your Number

Select your plan and complete checkout. Your unique UK carrier profile (QR code) is autogenerated and delivered instantly to your secure email.

PHASE 02

Quick Phone Setup

Scan the QR code in your device settings. Your phone establishes a Tier-1 connection to the UK Core. Label the line as **"SecondSIM"** for parallel chat isolation.

VERIFIED

Business Live

Open WhatsApp Business. Enter your new UK number. Receive the verification code via your active carrier slot and secure your professional identity.

Identity Verified

Real-Time GSMA Sync

Business Technical Verdict

WhatsApp's security layer monitors the **Type Allocation Code (TAC)** of incoming numbers. Public VoIP pools are routinely flagged as "Disposable." SecondSIM bypasses these blocks by assigning a **Dedicated Carrier Slot** with a verified UK **IMSI range**, ensuring your account is recognized as a legitimate "Enterprise Asset" rather than a software-generated proxy.

Verification_Path: INSTANT_GSM_HANDSHAKE

Success_Rate_90D: 100.0%_STABLE

Profile_Type: MNC-UK-MOBILE-CORE

Asset_Trust_Tier: TIER-1_AUTHORITY

Expert Insights

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