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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Cellular telephony’ Category

My first mobile phone was not a Nokia but a Motorola which I still have just like the first Nokia banana

Posted by jpluimers on 2025/04/11

A while ago someone asked on Twitter if people had mobile phones in the early 1990’s.

I bought my first GSM phone in 1995. Unlike my other mobile non-smart phones that were from Nokia, this one was from Motorola.

It was the international GSM version of the Motorola MicroTAC series (see picture below) which by then was way more affordable and smaller than the Nokia devices (see Nokia 2010 – Wikipedia and Nokia 2110 – Wikipedia).

This was in the age that world wide there were various competing mobile phone network standards.

Read the rest of this entry »

Posted in About, Cellular telephony, GSM, History, Personal, Power User, Telephony | Leave a Comment »

Albert Heijn needs to give their AH-mobiel pre-paid user-experience more love

Posted by jpluimers on 2024/05/09

If you have an prepaid Dutch AH-mobiel SIM card, topping it up or refilling is a hell as none of the web-links you get via SMS or top vouchers function.

When you get an SMS warning that your account is almost running out, it contains the link to [Wayback/Archive] ah.nl/opwaarderen which has no indication how to refill.

When buying a refill voucher at the Albert Heijn store, it contains two links that lead to HTTP 404 error pages:

Albert Heijn has their own [Wayback/Archive] ah.nl domain (which sometimes is totally down), but the refill link is on a completely different domain which – from a phishing point of view – is ideal to lure people into other refill pages.

The only Albert Heijn web-page linking to the actual refill link is [Wayback/Archive] Sim Only | Albert Heijn: ah.nl/over-ah/winkelservices/mobiel/sim-only.

The on-line refill link is [Wayback/Archive] AH mobiel opwaarderen: https://reload.alphacomm.network/web/ah which raises all kinds of red phishing flags:

Read the rest of this entry »

Posted in Cellular telephony, Development, Power User, Security, Software Development, Telephony, User Experience (ux), Web Development | Leave a Comment »

GSM/3G/4G/LTE/… enable or disable caller ID when calling

Posted by jpluimers on 2017/02/13

When testing the setup of a Fritz!Box 7490 with fiber connection, routing anonymous/withheld ISDN calls to a new answering machine I needed to test if only Caller ID calls were getting through.

The easiest was to do this from my mobile phone.

Izzy explained how to in callerid – How can I make anonymous calls for everyone but contact list? – Android Enthusiasts Stack Exchange.

Basically all cellular networks based on GSM or derived technologies allow you to prefix any phone numbers with:

–jeroen

Posted in Cellular telephony, ISDN, LifeHacker, Power User, PSTN, Telephony | Leave a Comment »