Changing Your Mobile Network & Upgrading To A New Handset

In this section, we’ll help you to change mobile network providers. We’ll also show you how to upgrade to the latest handset. Keep your old phone number & transfer your old data.

Have you decided to change either your mobile network or mobile handset? Whether it’s one or the other, this section of our website aims to help you out. For anyone changing network, we’ll show you how to keep an old phone number and also how you can unlock a smartphone for use on different networks. For those changing handset, we’ll show you how to get a new SIM card and also how to transfer your data to a brand new device.

Please select an article to begin reading more:

Your Comments

We'd love to hear your thoughts and any questions you may have. So far, we've received 13 comments from readers. You can add your own comment here.

  1. Mark said:

    I wondered if you could help me I purchased an iPhone 6s directly from last year I’m wondering if I can use a Sim card I purchase in Japan when I go there next year.
    I know the phone is unlocked but I don’t know if it internationaly unlocked can you help? thank you

    1. Ken replied:

      Hi Mark,
      Yes – the great news is your iPhone is also unlocked for use internationally. You can use it abroad in other countries with a different SIM card without issue.

      1. Mark replied:

        Thank you this has really helped this will save me a fortune when I have to just open Google maps
        Because data costs are insane for visiting Japan.. 🙂

  2. Jenny S said:

    Hi Ken
    Thank you for your very informative & interesting site.
    I have recently had to leave Tesco Mobile as the service this year has deteriorated a lot (no signal for 3 months of the year!) and have switched to Asda pay as you go as their tariff is really good, but was disappointed to find out I cannot send short code texts. I now find that a lot of networks don’t allow you to do this. Can you recommend a reasonably priced network that does allow you to send 5 digit texts?

    1. Ken replied:

      Hi Jenny,
      Thanks for your comment. Unfortunately, I couldn’t give you any specific advice about five-digit short codes (I’m not sure whether there’s a list of which mobile networks support this functionality?). I suppose my first suggestion is to see if you can find an alternative number (e.g. is there a regular landline or mobile number you could text instead?). If not, it might be the case you’ll need to go with one of the major networks who’ll probably be more likely to support this functionality.

  3. john sanger said:

    Hi ken
    thanks for all the info on mobile phones its one of the best I have seen on line I have just joined ee mobile on pay as you go. do I have to use the mobile within 6months or I will loose my number and money on the account
    thanks for your help
    john sanger

    1. Ken replied:

      Hi John,
      Thank you for the kind words! Take a look at the article here for more information but in short: yes, you’ll need to use your Pay As You Go phone at least once every 6 months to keep it active.
      Hope this helps,

  4. Pat Rouse said:

    I’m in Spain on holiday and my orange htc phone has died. Can’t get it to charge or anything. We were due to go home tomorrow but my husband’s had a heart attack and we won’t be able to fly for another 3 weeks. If I buy an Orange phone in Spain can I put my UK Orange SIM into it.

    1. Ken replied:

      Hi Pat,
      Very sorry to hear of the situation: wishing you both all the best & hoping your husband will get well soon.
      In response to your question: if you buy a locked smartphone from any of the Spanish networks, it will only work on that specific Spanish network. So an Orange Spain phone will not accept Orange UK SIM cards. The same goes for Vodafone Spain handsets (they will not accept Vodafone UK SIM cards). Your only real option for buying a phone is Spain is probably to buy one that’s SIM-free/unlocked (try the Phone Warehouse, which is the Spanish equivalent of the Carphone Warehouse).

  5. Shell said:

    Hello ken thanks for this site Very informative and easy to follow, will bookmark and spread the word…..
    Question; do they have a legal requirement to give a pac code if the phone is disconnected ?

    1. Ken replied:

      Hi Shell,
      Thanks for the comment. Unfortunately, this is one situation not covered by the PAC Code system. If your phone line has already been disconnected, the number will have normally been lost and would have hence been returned to your mobile phone network. Unfortunately, if this has already happened, it would mean there’s no way of getting your number back. As a small lifeline, rather than disconnecting you, some networks will change your account to one on Pay As You Go. It’s also worth contacting your old network to see whether the phone number is still available to you (e.g. it may have been frozen).

  6. PD32 said:

    HI there
    My upgrade is due from O2, I want to take up the upgrade and send the phone to my friend in the USA. Please can you tell me if an at&t sim will work in the phone?

    1. Ken replied:

      Hi PD32,
      Your O2 handset should work on AT&T USA’s 3G network providing it’s unlocked and providing it supports quad-band 3G (this should be true of most smartphones being sold today). If you’d like to check specifically for your handset, check the spec sheet for 3G support at 850MHz or 1900MHz. For AT&T’s 4G network, it’ll need to support band 17 (LTE at the 700MHz frequency).
      Hope this helps,

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