ONSIM isn't just a SIM card; it's a complete communication platform designed specifically for teams that need to stay professional, compliant, and connected.
📞 Your Landline... Anywhere!
Most "landline-on-mobile" services require clunky apps that drain your battery and rely on a perfect 4G signal. ONSIM is different.
No Apps Required: We put your landline number (e.g., 0203, 0161) directly onto the SIM card.
Native Dialling: Use your phone’s standard keypad to make and receive calls. When you call out, your customer sees your professional business number, not your private mobile.
Reliability: Because it uses the native voice network rather than mobile data, your call quality remains crystal clear even in low-data areas.
⚡ Advanced "Big Office" Features
Just because you’re working remotely doesn't mean you should lose your office functionality. ONSIM brings enterprise features to your mobile handset:
Extension Numbers: Give every mobile an extension (e.g., Ext 201) for free internal calling.
Hold & Transfer: Easily put a customer on hold with music and transfer them to a colleague’s mobile or desk phone.
Network-Level Recording: Automatically record every call and SMS for training or compliance (MiFID II/GDPR) without any software.
👥 Built for Teams
ONSIM grows with your business. Our "Twinning" and sharing features ensure you never miss a lead:
Shared Numbers: One business number can ring across multiple SIM cards simultaneously. The first person to pick up takes the call.
Centralised Management: Add or remove users instantly and manage all policies (like out-of-hours routing) from a single secure dashboard.
🇬🇧 Top-Tier Network & UK Support
We believe that business-critical communication deserves best-in-class support.
Leading Coverage: Our service is powered by the UK’s leading network, covering 99% of the population and 90% of the landmass.
UK-Based Experts: When you need help, you speak to our dedicated support teams right here in the UK. No overseas call centres—just expert technicians who understand your business.