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Mobile-phone contract checklist

UK mobile phone deals are usually listed by the monthly price and quota of data, voice minutes and SMS message fragments (“texts”), but you might want to check the small print for the following additional details:

Back-end provider

Relevant to MVNO deals (MVNOs *can change* their upstream providers but this is rare)—check the signal is good in areas you care about.

Wi-Fi calling available?

Some buildings are conductive enough to attenuate *all* mobile networks, but make Wi-Fi available—if you use such a building then you might want to check the “Wi-Fi calling” options if your device supports it (see my notes on Wi-Fi Calling on Android). 

Conference calling available?

3-way calling might occasionally be needed if you know a language spoken by immigrant families who might ask you to be a last-resort interpreter (I say “last resort” because my policy is to pass the job to the professionals whenever possible, but occasionally it just has to be me), *or* if you need to help someone “dial in” to something when they themselves don’t understand how to do it. But *not all networks allow conference calling* so it’s worth checking before you sign up.

Can you deactivate voicemail?

If any of your contacts are refugees, international students or others likely to have pay-per-minute phones, or older people calling from a landline without a calls package to mobiles, then you likely won’t want them to *pay* for calls you didn’t manage to answer, nor to take an immediate financial hit when you had no signal. Phone networks are motivated to make voicemail hard to opt out of (which might also be why many of the non-voicemail based services to log incoming calls when you had no signal, such as “Call Catcher” and 1471 for mobile, have now been shut down)—voicemail increases their “call termination” income (by counting as a “connected” call), and they think most callers won’t mind because they’re on unlimited-minutes or hundreds-of-minutes contracts. Ease of deactivating voicemail is (I think) an important facet of a mobile deal that’s seldom advertised. 

Extra charge for SMS delivery confirmation?

SMS delivery is not guaranteed, and if you’re messaging someone who might have forgotten to tell you they’ve left the country (e.g. international students), or whose safety you’re concerned about, then it can be useful to *know* if your message was delivered to a phone (meaning at least the service is still connected and the phone still has power). But some networks charge extra for requesting delivery confirmation—which can accumulate if you sent a *lot* of texts with that bit still switched on. 

Can long SMS messages be sent?

Occasionally it is necessary to send someone a *lot* of text by SMS, e.g. if they have no data service and you need to send them a copy of an article. Although some devices insist on switching to the more expensive (and less widely-received) MMS protocol for this, with correct configuration you might be able to send a whole article by SMS—but only if the network supports it. 

What happens if “unlimited” fair-use limits are reached?

“Unlimited” is often just an advertising code for “we don’t think normal people will reach the limit”, which is typically listed in the small print as a “fair-use limit”. Occasionally (e.g. if you suddenly have a *lot* of organising to do) you might get closer to it than you planned, so you might want to check what happens if you *did* reach it: will they just cut you off or will they bill you extra? 

“Tethering” included?

Some data deals stipulate that the data must be used from the phone itself and not via a personal Wi-Fi hotspot or USB “tethering”—and yes they do have ways to enforce or punish this, so if you’ll ever need to do it, you’d better check the contract supports it. 

195 access

If you have a disability that prevents you from using standard printed editions of “The Phone Book” then you should be registered for the 195 service (free directory enquiries)—and it’s an Ofcom requirement that all networks (including MVNOs) carry these calls. Three and Vodafone let you pre-register your PIN with them so you don’t have to give it each time (Vodafone used to start charging for the 195 call after 75 seconds but Ofcom required that to stop; still pre-registration saves operator time). I don’t know of any MVNOs that support pre-registration, but you can still call 195 and provide your PIN in the normal way. 

Legal

The above is based on my experience—E&OE. All material © Silas S. Brown unless otherwise stated. Android is a trademark of Google LLC. Apple is a trademark of Apple Inc. H3G is a trademark of Hutchison Whampoa Enterprises Limited. iPhone is a trademark of Apple in some countries. Vodafone is a trademark of Vodafone Group Plc. Wi-Fi is a trademark of the Wi-Fi Alliance. Zoom is a trademark of Zoom Video Communications, Inc. Any other trademarks I mentioned without realising are trademarks of their respective holders.