SoSIM vs Slow Letters (Slow Reply)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SoSIM
Manage your Hong Kong prepaid SIM card services, including data usage, top-ups, and plan changes. This app allows you to switch between local and travel data, apply for number portability, and access support.
- Enquire data usage and SIM expiry
- Purchase Hong Kong/Travel data packages
- Instant top-up functionality
- Mobile Number Portability (MNP) application
- eSIM and new number exchange
- Link to MoneyBack rewards
- Manage Real Name Registration
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SoSIM, a Hong Kong prepaid card that enables you to freely switch between using Hong Kong Local or Travel Data. eSIM is available at SoSIM eShop or you can grab a SoSIM everywhere at over 400 stores in Hong Kong too. Manage SoSIM services in SoSIM App anytime and stay connected anywhere in the world. That’s So Simple! SoSIM App: - Enquire data usage/ SIM expiry date - Purchase services (Hong Kong/Travel Data Package) - Instant top-up - Self Help Application of Mobile Number portability (MNP) - Change to eSIM/ Exchange new number - Link to MoneyBack - Referral rewards - Manage Real Name Registration - User Guide/ Online support - JetSO updates SoSIM for an easier life, So Simple! Contact us: www.sosimhk.com
Slow Letters (Slow Reply)
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**Slow Letters** is a correspondence app for people who want depth over speed. Every correspondent is built with a full life dossier from birth onward: childhood, habits, relationships, turning points, and emotional rhythm. When you write, your letter enters this living context, and the reply reflects that character's history and current mood. What you can do: - Move between the `Relations`, `Discover`, and `Account` tabs - Browse correspondents with profile archives and timeline context - Write the first letter, save the relationship draft, and wait for the exchange to unfold - Review recovery, language, sign-out, and account deletion controls in `Account` Slow Letters is not chat. It is a slower, intentional form of communication. Terms of Use: https://app.justlove.work/terms?locale=en-US
Screenshots
Verdict
The clearest difference is update cadence: Slow Letters (Slow Reply) at fortnightly against SoSIM's every 3 months. Slow Letters (Slow Reply) also leads on iOS requirement (13.0 vs 15.6). 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.
SoSIM ships an update every 3 months, Slow Letters (Slow Reply) fortnightly. The most recent releases landed on November 11, 2026 and November 9, 2026 respectively.
| Parameter | SoSIM | Slow Letters (Slow Reply) |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (4 ratings) — better | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 47 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Hutchison Telephone Company Limited | 闻欣 黄 |
In-app purchases
SoSIM
No in-app purchases
Slow Letters (Slow Reply)
No in-app purchases
Questions
Is SoSIM free?
Is Slow Letters (Slow Reply) free?
Do SoSIM or Slow Letters (Slow Reply) have ads?
Which is updated more often, SoSIM or Slow Letters (Slow Reply)?
Other comparisons
