# 1Sim Assist

> International traveler's dialer for correcting mobile calls while roaming. (iPhone/iPad app by Belmont Telecom, Inc..)

- Source: https://appshunter.io/ios/app/1sim-assist/id862469463 (this page in markdown: same URL + `.md`)
- Developer: [Belmont Telecom, Inc.](https://appshunter.io/developer/510353132)
- Category: Productivity, Travel
- Price: Free
- Rating: 1.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 8.0 · 17 MB
- Languages: American English
- Released: 2014-05-05
- Data updated: 2026-06-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/1sim-assist/id862469463/reviews.md

## What is 1Sim Assist?

The OneSimCard Assist app makes it easier for international travelers to make a mobile phone call while roaming internationally. The dialer of the app will automatically correct a misdialed number. The app will add international prefixes and country codes. It will also drop or add zeros where needed or prompt the user to enter a correct phone number without sending a misdialed call to the carrier for connection. 

These features will reduce both erroneous call billing due to misdialed numbers and aggravation during international roaming. The app also works with any SIM card, not only with OneSimCard.

## Key features

- Automatic number correction
- Adds international prefixes
- Adds country codes
- Manages leading zeros
- Works with any SIM card


## Frequently asked questions about 1Sim Assist

### Does 1Sim Assist have ads?

No, 1Sim Assist does not contain advertisements. It is a free application.

### What devices support 1Sim Assist?

1Sim Assist is available for iPhone and iPod devices.

### How often is 1Sim Assist updated?

The latest version, 2.3, was released on January 25, 2018. The app was initially released on May 5, 2014.

### What is the age rating for 1Sim Assist?

1Sim Assist has an age rating of 4+.

### Can 1Sim Assist be used with any SIM card?

Yes, the app is designed to work with any SIM card, not exclusively with OneSimCard.

### What is the user rating for 1Sim Assist?

1Sim Assist has a rating of 1.0 stars based on 1 review.

### How does 1Sim Assist help with international calls?

It automatically corrects misdialed numbers by adding necessary international prefixes, country codes, and managing leading zeros, preventing erroneous billing and connection issues.

## Version history (last 5 releases)

### 2.3 — 2018-01-25

This app has been updated by Apple to display the Apple Watch app icon.

Bug fixes

### 2.2 — 2016-05-10

-Bug fixes

### 2.1 — 2015-08-13

-Minor bug fixes

### 2.0 — 2015-07-30

-Enhanced dialing completion
-Bug fixes

### 1.3 — 2015-01-09

-Bug fixes

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## More apps by Belmont Telecom, Inc.

- [1SIM VoIP](https://appshunter.io/ios/app/1sim-voip/id510371587)
- [1Sim Connect](https://appshunter.io/ios/app/1sim-connect/id680700348)
- [My OneSim](https://appshunter.io/ios/app/my-onesim/id1164159803)
- [1SIM IoT](https://appshunter.io/ios/app/1sim-iot/id1512993522)
- [1SIM eSIM](https://appshunter.io/ios/app/1sim-esim/id1531090410)

All apps by Belmont Telecom, Inc.: https://appshunter.io/developer/510353132

## Related topics

[1sim assist](https://appshunter.io/ios/topics/1sim-assist)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-24.*