---
product_id: 246454733
title: "OneCall O2 Prepaid 30 Day Unlimited Data SIM - 4G/5G, 25GB EU Roaming"
brand: "onecall"
price: "336 zł"
currency: PLN
in_stock: true
reviews_count: 8
category: "One Call"
url: https://www.desertcart.pl/products/246454733-onecall-o2-prepaid-30-day-unlimited-data-sim-4g-5g
store_origin: PL
region: Poland
---

# 25GB EU roaming data 4G/5G blazing speeds 30-day prepaid no top-ups OneCall O2 Prepaid 30 Day Unlimited Data SIM - 4G/5G, 25GB EU Roaming

**Brand:** onecall
**Price:** 336 zł
**Availability:** ✅ In Stock

## Summary

> 📡 Stay limitless, roam fearless with OneCall O2 SIM!

## Quick Answers

- **What is this?** OneCall O2 Prepaid 30 Day Unlimited Data SIM - 4G/5G, 25GB EU Roaming by onecall
- **How much does it cost?** 336 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/246454733-onecall-o2-prepaid-30-day-unlimited-data-sim-4g-5g)

## Best For

- onecall enthusiasts

## Why This Product

- Trusted onecall brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fast & easy activation:** Get online within 30 minutes, no waiting around
- • **Seamless 25GB EU roaming:** Travel Europe with data freedom included
- • **Instant multi-size SIM fit:** Nano, Micro & Standard sizes for any device
- • **No contracts, no credit checks:** Freedom to switch or stop anytime, zero hassle
- • **Unlimited UK calls, texts & data:** Stay connected without limits or surprise bills

## Overview

The OneCall O2 Prepaid 30 Day SIM delivers unlimited UK calls, texts, and 4G/5G data with lightning-fast speeds and zero contracts. It includes 25GB of EU roaming data at no extra cost, fits all device SIM slots, and activates quickly for hassle-free connectivity wherever you go.

## Description

Product description A prepaid O2 30 Day Unlimited Data only SIM card. No contracts. This Data only SIM will work in any compatible devices, Routers, Tablets, iPads, Dongles, Laptops, Mobile Phones, CCTV and Alarm Systems to name a few. Sim comes in 3 different sizes (Nano, Micro & standard) to fit all devices. Enjoy European roaming while you travel with 25GB of data (see qualifying countries in images) Once you have received your SIM, to activate it. . If you are having issues connecting your SIM please contact us via our online chat or our customer service number. Legal Disclaimer The fixed 30 day period begins upon activation not purchase of the SIM cards. To activate your SIM please visit www.OneCall.stream. Activation can take up to 48 hours. Returns are not possible after the product has been activated. Cannot be used outside the EU. Not to be used in any equipment which enables the sending of bulk SMS, voice or data services for commercial purposes. SIM card will not be activated over the weekend or on Bank Holidays

Review: Very quickly activated - This is only the 2nd month using my unlocked B535-333 4G+/LTE CAT7 mobile router. (https://amzn.eu/d/15hHLOV) The first month a different company supplied the sim. Which was also a 02 sim, and that was okay too. But when the first month was coming to an end the previous company wanted to charge me £5 per month more than what I paid for the 1st month. So I shopped around and got this deal with onecall. If they don’t try and hike their rates I may well stay with them. Popped the sim card into my 4g router, followed the set up instructions that came with it, and onecall activated it very quickly! It was up and running within 30 mins! (Tuesday morning). Very simple and efficient procedure. Tried it at 2 different addresses, 15 miles apart. Address 1, where download speeds weren’t brilliant, but done the job. Was getting between 4mbps and 20mbps. Albeit we were experiencing some bad storms. Never seemed to affect my internet usage including my streaming of now tv. Next morning 5.30am I was getting faster speeds of around 55mbps. But it slowed down again during peak times. Address 2 (and where it will mainly remain for the time being). (Storms had ended by the time it was used at address 2). Speeds were much faster, always between 30mbps and 85mbps. Having experienced no real inconvenience with this sim for 2 weeks now, and the easy no nonsense speedy activation process I give it 5 stars. *Update* 12th March 2024 I’ve since had a 2nd sim from onecall via desertcart. Same online set up procedure. Was on a Friday morning. Only took onecall 10 mins this time to activate. Just don’t try and activate at the weekend, as no one’s there it seems.
Review: Reviewed - Well after a blip with signal it's working fine now so not the fault of the SIM 🤔🤗🤗

## Features

- Pre-loaded O2 SIM card with UNLIMITED calls, texts & 4G/5G Data for use in the UK. Fast 4G/5G Speeds with No Restrictions.
- Includes 25GB of Data which can be used to Roam Free at no extra cost in the EU
- Eliminate the Hassle of a PAYG SIM card with this Prepaid 30 Day SIM - No top ups required
- SIM card is packaged for all sizes for free: Nano, Micro and standard SIM card size
- No Contracts, No Commitments, No Credit Checks

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08KDY64TQ |
| Best Sellers Rank | 22,135 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 28 in Prepaid Phone Cards |
| Guaranteed software updates until | unknown |
| Manufacturer | OneCall |
| Product Dimensions | 23 x 15 x 0.1 cm; 5 g |

## Product Details

- **Brand:** OneCall
- **Cellular technology:** LTE
- **Number of items:** 1
- **Service provider:** O2

## Images

![OneCall O2 Prepaid 30 Day Unlimited Data SIM - 4G/5G, 25GB EU Roaming - Image 1](https://m.media-amazon.com/images/I/41BRMM-vI0L.jpg)

## Questions & Answers

**Q: can i activate when i get to france or does it need activation withinin uk before i set off**
A: Yes, this SIM card can be activated from anywhere. You activate the SIM by filling in the activation form on the website, so as long as you have access to the internet you can activate the SIM.

**Q: hi can you activate from a router?**
A: Yes, all our SIMs can be used in most routers and mifi devices

**Q: Is this sim compatible with an Amazon fire 8 tablet?**
A: It's basically a prepaid sim like any sim card ...if the tablet excepts sim cards then shouldn't be a problem

**Q: will this work in turkey**
A: Unfortunately, Turkey is not included in the free-to-roam bundle on this SIM.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very quickly activated
*by S***E on 4 February 2024*

This is only the 2nd month using my unlocked B535-333 4G+/LTE CAT7 mobile router. (https://amzn.eu/d/15hHLOV) The first month a different company supplied the sim. Which was also a 02 sim, and that was okay too. But when the first month was coming to an end the previous company wanted to charge me £5 per month more than what I paid for the 1st month. So I shopped around and got this deal with onecall. If they don’t try and hike their rates I may well stay with them. Popped the sim card into my 4g router, followed the set up instructions that came with it, and onecall activated it very quickly! It was up and running within 30 mins! (Tuesday morning). Very simple and efficient procedure. Tried it at 2 different addresses, 15 miles apart. Address 1, where download speeds weren’t brilliant, but done the job. Was getting between 4mbps and 20mbps. Albeit we were experiencing some bad storms. Never seemed to affect my internet usage including my streaming of now tv. Next morning 5.30am I was getting faster speeds of around 55mbps. But it slowed down again during peak times. Address 2 (and where it will mainly remain for the time being). (Storms had ended by the time it was used at address 2). Speeds were much faster, always between 30mbps and 85mbps. Having experienced no real inconvenience with this sim for 2 weeks now, and the easy no nonsense speedy activation process I give it 5 stars. *Update* 12th March 2024 I’ve since had a 2nd sim from onecall via Amazon. Same online set up procedure. Was on a Friday morning. Only took onecall 10 mins this time to activate. Just don’t try and activate at the weekend, as no one’s there it seems.

### ⭐⭐⭐⭐ Reviewed
*by R***N on 5 September 2024*

Well after a blip with signal it's working fine now so not the fault of the SIM 🤔🤗🤗

### ⭐ Numerous hours spent trying to activate sim
*by K***T on 23 April 2023*

I required a SIM card to use with a newly purchased 5g router. My mobile phone is o2 so I decided to use o2 for the router. I wanted to try it first before entering into a contract so I ordered this 30 day unlimited data sim. The SIM card was received but didn’t include a telephone number and without the number, I can’t activate the SIM card. So far I have spent over 6 hours trying to activate it and talking to a bot on the o2 website. My advice is , unless onecall provide a number with the SIM card. Don’t buy this item. Really really disappointed.

## Frequently Bought Together

- OneCall O2 Prepaid 30 Day Unlimited Data SIM - 4G/5G, 25GB EU Roaming
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- O2 Data Sim Card Preloaded with UNLIMITED 4G/5G Data. Includes 25GB to Roam for Free in 47 Countries. No Contracts, No Commitments, No Credit Checks, No Tie-ins, No Personal ID. (Valid for 1 Month).

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**Shop now:** [https://www.desertcart.pl/products/246454733-onecall-o2-prepaid-30-day-unlimited-data-sim-4g-5g](https://www.desertcart.pl/products/246454733-onecall-o2-prepaid-30-day-unlimited-data-sim-4g-5g)

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*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-03-18*