Before you download Miio, read this.

Miio (used across Portugal, Spain, and France) has a documented pattern of complaints about non-refundable prepaid balances, billing for sessions that never actually charged, and unresponsive support — including a case where the Portuguese Consumer Authority couldn't get a refund issued.

01 What's actually documented

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Miio doesn't charge per kWh at the point of use — it deducts from a prepaid "wallet." Users report that unused wallet funds are effectively non-refundable and can only be spent inside the app, even after the rental car or trip is long over.

Source — user complaint, travelinti.com (2025)

Billed without charging

A user reported the app showed "not connected, not charging" for an entire session, tried for 40+ minutes to stop it through every method available, and was still invoiced for the session afterward. Miio's own support reportedly acknowledged similar cases from other users.

Source — App Store review, apps.apple.com/miio

Refund promised, never paid

A Trustpilot reviewer paid Miio to activate a charger that turned out to be non-functional, was told by Miio's own helpline they were aware of the fault, and received written agreement from Miio to refund the payment — which was never actually paid out. The Portuguese Consumer Authority contacted Miio on the customer's behalf and reportedly got no response either.

Source — Trustpilot review of miio.com

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Multiple reviewers describe being charged more than the energy actually delivered (one cites a charge of €12.50 for a session their car's own app measured at 7.7 kW), and describe support as effectively unreachable — invalid contact email, no resolution after hours of waiting.

Source — App Store & justuseapp.com aggregated reviews

USE AT YOUR OWN RISK. Miio's own App Store changelog acknowledges "stuck cables" as a known issue — the charging cable itself can fail to release from your vehicle after a session, leaving your car physically tethered to the station. Reports also describe being billed for sessions the app itself showed as "not charging."

02 Cable won't release

Confirm the session is actually stopped in the app — not just showing "not charging."
Try locking, then unlocking the car with the key fob (releases many stuck latches).
Miio's official guidance is to call the charging station operator, whose number is supposed to be posted on the station itself — but reviewers report that number is often missing, wrong, or unanswered.
Check your vehicle's manual for the manual/emergency cable release, often in the trunk near the charge port — note that few public charging stations offer a manual override on their end, so this is usually the more reliable fallback.
Don't force the connector — it's a common way to damage the charge port itself.

03 Already lost money

Screenshot everything: the session, the charge, any support replies.
Dispute the charge with your card issuer/bank directly — this tends to get faster results than app support.
In Portugal, you can file with DECO (Associação Portuguesa para a Defesa do Consumidor) or the Direção-Geral do Consumidor.
Leave a dated, factual review (App Store, Google Play, Trustpilot) — it's part of what surfaced the pattern above.

04 Report it to Apple / Google

Apple App Store — reports go through Apple's dedicated problem-reporting site, separate from a normal review.

Go to reportaproblem.apple.com and sign in with the Apple ID you used.
Click "I'd like to" and choose "Report a scam or fraud" (use "Report a quality issue" if you didn't lose money, just had a bad experience).
Select the Miio app from your purchase/download history, describe what happened, and submit.
If you also lost money on an in-app purchase (wallet top-up), you can separately choose "Request a refund" in the same "I'd like to" menu.

App listing: apps.apple.com/miio · Official guidance: support.apple.com/122712

Google Play Store — flagging is built into the app listing itself.

Open the Miio listing: play.google.com/store/apps/details?id=com.muvext.miio
Tap the three-dot menu (⋮) near the top of the listing.
Select "Flag as inappropriate."
Choose the closest reason — "Harmful to device or data" if you believe there's a technical/security issue, or "Other objection" for billing/fraud complaints — and add details.
Submit. Google won't send an individual reply, but flags feed into their review process.

Official guidance: support.google.com/googleplay/answer/2853570

Also worth doing, in parallel:

Leave a dated, factual written review on the app's store page — reviews carry more public weight than a backend flag.
If you're in Portugal: file with Livro de Reclamações or DECO.
Dispute the charge directly with your card issuer — chargebacks tend to move faster than any app-store report.

> This page summarizes publicly available user reports as of September 2026. It isn't a legal filing or an official investigation — treat it as "read before you download," not a final verdict.