Subject comparison
Glossary
Every term this site uses, with the pairs people most often confuse.
Photo from a free stock library — illustration only.Important notice: keyanok is an independent information site. We are not a mobile network, and we are not affiliated with, endorsed by or connected to Three, O2, Sky Mobile, EE, Vodafone or any other provider. We do not sell SIM cards, contracts, handsets or services of any kind. Every comparison here is general guidance and opinion only — always confirm current details with the provider's own website or app before deciding anything.
Confused pair — PAC vs STAC
PAC
Texted to 65075. Carries your existing number to the new operator.
- Free, within minutes
- Valid thirty days
- Use this unless you want a new number
VS
STAC
Texted to 75075. Closes the account without carrying the number.
- Identical mechanics
- New number at the gaining operator
Which wins, and for whom
PAC in almost every case. Porting is free and an established number is worth keeping.
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Call 020 3896 5248WhatsApp usConfused pair — coverage vs congestion
Coverage
Whether signal reaches you at all.
- Few or no bars
- Building materials and distance
- Wi-Fi Calling is the remedy
VS
Congestion
How many devices are sharing the mast.
- Full bars, no throughput
- Peak hours and busy places
- No setting resolves it
Which wins, and for whom
Different problems with different answers. Switching network helps the first and may do nothing for the second.
Switching and numbers
PACThe free code (65075) carrying your number to a new operator within thirty days
STACThe same mechanism (75075) where you relinquish the number
PortingThe transfer itself, ordinarily within one working day
Radio and calling
4G Calling / VoLTEVoice carried over 4G — required since the 3G withdrawals
Wi-Fi CallingCalls and texts over your broadband; the standard indoor remedy
Standalone 5G / 5G+5G on its own modern core rather than leaning on 4G
Re-farmingReusing old spectrum for newer technology — why maps shift year to year
Money and disputes
Fair-use ceilingThe published limit inside an 'unlimited' allowance, principally abroad
TetheringSharing handset data with a laptop; capped on some plan generations
Split contractDevice credit and airtime billed separately, so device payments end at repayment
Spend capA free, customer-set limit on out-of-allowance charges
MVNOA brand renting masts rather than owning them
Deadlock letterA provider's formal final response — your immediate route to the ombudsman
7726The free number for forwarding fraudulent texts to operator fraud teams
Important notice: keyanok is an independent information site. We are not a mobile network, and we are not affiliated with, endorsed by or connected to Three, O2, Sky Mobile, EE, Vodafone or any other provider. We do not sell SIM cards, contracts, handsets or services of any kind. Every comparison here is general guidance and opinion only — always confirm current details with the provider's own website or app before deciding anything.