1SIM VoIP vs Echo Mobile VoIP
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
Read full descriptionHide full description
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.
Echo Mobile VoIP
Read full descriptionHide full description
Echo Mobile is a SIP softclient that extends VoIP functionality beyond the land line or desk top. It brings features of the Echo Networks platform directly to end-user's mobile devices as a Unified Communications solution. With Echo Mobile, users are able to maintain the same identity when making or receiving calls from any location, regardless of their device. They are also able seamlessly send an ongoing call from one device to another and continue that call without interruption. Echo Mobile grants users the ability to manage contacts, voicemail, call history and configurations in a single location. This includes the management of answering rules. greetings, and presence which all contribute to more efficient communication.
Screenshots
Verdict
The clearest difference is update cadence: 1SIM VoIP at monthly against Echo Mobile VoIP's every 6 months. 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, Echo Mobile VoIP every 6 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | 1SIM VoIP | Echo Mobile VoIP |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (87 ratings) — better | — |
| Positive reviews | 26.7% of reviews | — |
| Number of ratings | 87 — better | — |
| Update frequency | Monthly — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 86 MB | 121 MB |
| Age rating | 4+ | 4+ |
| Developer | Belmont Telecom, Inc. | Echo Networks, LLC |
In-app purchases
1SIM VoIP
No in-app purchases
Echo Mobile VoIP
No in-app purchases
Questions
Is 1SIM VoIP free?
Is Echo Mobile VoIP free?
Do 1SIM VoIP or Echo Mobile VoIP have ads?
Which is updated more often, 1SIM VoIP or Echo Mobile VoIP?
Other comparisons















