Comparison

1SIM VoIP vs GP UC

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read 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.

About

GP UC

Features
Read full description

HGC UC Anywhere is an integrated, feature-rich, cloud-based unified communications (UC) solution to suit corporations of any size, serving your everyday business communication needs and allowing your employees to communicate anywhere and at any time while maintaining high fidelity and providing the audio quality of the future, today. This mobile client is for existing customer subscribed to HGC UC Anywhere service. Simply login with your provided QR code or telephone number and you will be able to pair with your desk phone. Make and answer business calls no matter where you are in the world. For service plan details, please refer to our website at https://www.hgcbiz.com

Screenshots

1SIM VoIP3 screens
GP UC4 screens

Verdict

The call

The clearest difference is update cadence: 1SIM VoIP at monthly against GP UC's every 31 months. GP UC's advantage is iOS requirement (12.0 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

1SIM VoIP ships an update monthly, GP UC every 31 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard2 real differences · 8 level
1SIM VoIP versus GP UC: the parameters behind the verdict, then further details
Parameter1SIM VoIPGP UC
PriceFreeFree
Rating4.3 (87 ratings) — better—
Positive reviews26.7% of reviews—
Number of ratings87 — better—
Update frequencyMonthly — betterEvery 31 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.012.0 — better
Further details — not scored
Size86 MB128 MB
Age rating4+4+
DeveloperBelmont Telecom, Inc.Deltapath, Inc.

In-app purchases

None

1SIM VoIP

No in-app purchases

None

GP UC

No in-app purchases

Questions

Is 1SIM VoIP free?
1SIM VoIP is free to download, with no in-app purchases.
Is GP UC free?
GP UC is free to download, with no in-app purchases.
Do 1SIM VoIP or GP UC have ads?
Neither 1SIM VoIP nor GP UC shows ads.
Which is updated more often, 1SIM VoIP or GP UC?
1SIM VoIP ships an update monthly, and GP UC every 31 months. Most recently, 1SIM VoIP was updated on November 1, 2026 and GP UC on November 3, 2026.

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