1SIM VoIP vs Software25
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
1SIM VoIP
This app offers significantly reduced international calling and texting rates for existing customers. It leverages Wi-Fi or mobile data to facilitate these communications, providing a cost-effective alternative to standard roaming charges. Users need an active account and a specific enabled number to utilize its features.
- Reduced international call rates
- Low-cost international SMS
- Wi-Fi and mobile data calling
- VoIP and SMS enabled Personal Extra Number
- Select call routing method
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OneSim VoIP provides OneSimCard customers with an even less expensive way to make and receive international calls on their iPhone mobile phones or iPads. To use OneSim VoIP, users must have a good quality Wi-Fi, 3G, 4G or LTE Internet connection and a VoIP-enabled Personal Extra Number (PEN) activated with OneSimCard. When making an outgoing call, OneSimCard users can select the way the call will be made – either through the OneSimCard international SIM card or OneSimCard VoIP network. Calls made over the VoIP network are generally much less expensive than OneSimCard’s standard international roaming rates. Incoming calls made to the PEN will be received through low-cost VoIP if the OneSimCard phone and OneSim VoIP app are registered on the Internet. Otherwise, the call will be sent the usual way to the phone through the international SIM card. The newer version 2 of the app adds the texting feature and allows the sending and receiving texts (SMS) to and from US and Canada mobile phones over Wi-Fi or mobile data at much lower rates than regular SMS sent and received over the roaming network. The app does not require having a OneSimCard SIM installed in the phone, but it does require having a OneSimCard account and a VOIP and SMS enabled PEN. Initial settings for the app are available in the “My SIM Cards” menu of the OneSimCard online account. When in the My SIM Cards menu, select the SIM (if there are more than one on your account) and then click on the Create VoIP Account link. This will create a OneSimCard VoIP account and provide you with a link with Settings information for your iPhone or iPad. Important: Connection quality of the calls made using OneSim VoIP option over the Internet will only be as good as the quality of the Internet connection. Please be advised that in many cases this kind of connection quality is inferior to the connection quality made through the OneSimCard international SIM card roaming network.
Software25
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What makes Software25 special? Each program was designed by a business owner who faces the same problems you do. All our programs integrate automatically. Most business software is expensive and you only end up using a small part of it. With us you can select each program separately or combine them depending on your business needs. Desktop and mobile compatible - our programs are with you wherever you are.
Screenshots
Verdict
The clearest difference is update cadence: Software25 at every 11 days against 1SIM VoIP's monthly. Software25 also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
1SIM VoIP ships an update monthly, Software25 every 11 days. The most recent releases landed on October 14, 2026 and October 12, 2026 respectively.
| Parameter | 1SIM VoIP | Software25 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (84 ratings) — better | — |
| Positive reviews | 26.7% of reviews | — |
| Number of ratings | 84 — better | — |
| Update frequency | Monthly | Every 11 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 86 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Belmont Telecom, Inc. | Darren Mullan |
In-app purchases
1SIM VoIP
No in-app purchases
Software25
No in-app purchases









